How do we get ipaddress or hostaddress using c#
HttpContext.Current.Server.MachineName
HttpContext.Current.Request.ServerVariables["local_addr"]
Wednesday, April 16, 2008
Changing Connection string dynamically using Application_BeginRequest
You developed webapplication, you hosted in two different server.One server name is
"Production" and another server name is "Testing". The below code connection string will change dynamically based on server host information.
Example:
<appsettings>
<add key="production" value="http://www.production.com">
<add key="ProductionconnectionString" value="server=localhost;...." >
<add key="testconnectionString" value="server=localhost;...." >
</appsettings>
Public Application_BeginRequest()
{
bool production=false;
if(Request.URL.Host==ConfiqurationManager.Appsettings("production"))
{
Production=true;
}
}
if(Production==true)
{
context.items.add("connectionStrings",ConfiqurationManager.Appsettings("production"))
}
else
{
context.items.add("connectionStrings",ConfiqurationManager.Appsettings("test"))
}
}
"Production" and another server name is "Testing". The below code connection string will change dynamically based on server host information.
Example:
<appsettings>
<add key="production" value="http://www.production.com">
<add key="ProductionconnectionString" value="server=localhost;...." >
<add key="testconnectionString" value="server=localhost;...." >
</appsettings>
Public Application_BeginRequest()
{
bool production=false;
if(Request.URL.Host==ConfiqurationManager.Appsettings("production"))
{
Production=true;
}
}
if(Production==true)
{
context.items.add("connectionStrings",ConfiqurationManager.Appsettings("production"))
}
else
{
context.items.add("connectionStrings",ConfiqurationManager.Appsettings("test"))
}
}
Support Multiple Browser Image control
You are developing a web application that must support a variety of browser. Your analysis indicates that the majority of users that will access Internet explorer 6.0 and packet internet explorer 4.0 you are creating the header for the webapplication. you want to display variety of brower. The below example you can see image display with different browser.
Example:
<asp:image id="cklogo" runat="server" ImageUrl="Images/ck_logo.jpg" PIE4.0:imageurl="Images/small/ck_logo.jpg">
Example:
<asp:image id="cklogo" runat="server" ImageUrl="Images/ck_logo.jpg" PIE4.0:imageurl="Images/small/ck_logo.jpg">
Thursday, April 10, 2008
Cross Joins Using sqlserver
Using Cross Joins
A cross join that does not have a WHERE clause produces the Cartesian product of the tables involved in the join. The size of a Cartesian product result set is the number of rows in the first table multiplied by the number of rows in the second table. This is an example of a Transact-SQL cross join:
USE pubs
SELECT au_fname, au_lname, pub_name
FROM authors CROSS JOIN publishers
ORDER BY au_lname DESC
The result set contains 184 rows (authors has 23 rows and publishers has 8; 23 multiplied by 8 equals 184).
However, if a WHERE clause is added, the cross join behaves as an inner join. For example, these Transact-SQL queries produce the same result set:
USE pubs
SELECT au_fname, au_lname, pub_name
FROM authors CROSS JOIN publishers
WHERE authors.city = publishers.city
ORDER BY au_lname DESC
-- Or
USE pubs
SELECT au_fname, au_lname, pub_name
FROM authors INNER JOIN publishers
ON authors.city = publishers.city
ORDER BY au_lname DESC
A cross join that does not have a WHERE clause produces the Cartesian product of the tables involved in the join. The size of a Cartesian product result set is the number of rows in the first table multiplied by the number of rows in the second table. This is an example of a Transact-SQL cross join:
USE pubs
SELECT au_fname, au_lname, pub_name
FROM authors CROSS JOIN publishers
ORDER BY au_lname DESC
The result set contains 184 rows (authors has 23 rows and publishers has 8; 23 multiplied by 8 equals 184).
However, if a WHERE clause is added, the cross join behaves as an inner join. For example, these Transact-SQL queries produce the same result set:
USE pubs
SELECT au_fname, au_lname, pub_name
FROM authors CROSS JOIN publishers
WHERE authors.city = publishers.city
ORDER BY au_lname DESC
-- Or
USE pubs
SELECT au_fname, au_lname, pub_name
FROM authors INNER JOIN publishers
ON authors.city = publishers.city
ORDER BY au_lname DESC
Accessing server event using Ajax
Step:1
Install system.web.extension and ajax tools
Install ajax.dll in your system all add in reference of the project.
step:2
<httpHandlers>
<add verb="POST,GET" path="ajax/*.ashx" type="Ajax.PageHandlerFactory, Ajax" />
</httpHandlers>
step:3
Write javascript
<script language="javascript" type="text/javascript">
function Getconfirm()
{
var con=confirm("Are sure want to delete this");
var test;
if(con==false)
{
alert(Bala.Getvalue().value);
}
else
{
alert(Bala.Getvalue1().value);
}
}
</script>
step 4:
in c# page
public partial class Bala : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
Ajax.Utility.RegisterTypeForAjax(typeof(Bala));
//btnsubmit.Attributes.Add("onclick", "Getconfirm();");
}
[Ajax.AjaxMethod()]
public string Getvalue()
{
return "bala";
}
[Ajax.AjaxMethod()]
public string Getvalue1()
{
return "bala1";
}
}
Install system.web.extension and ajax tools
Install ajax.dll in your system all add in reference of the project.
step:2
<httpHandlers>
<add verb="POST,GET" path="ajax/*.ashx" type="Ajax.PageHandlerFactory, Ajax" />
</httpHandlers>
step:3
Write javascript
<script language="javascript" type="text/javascript">
function Getconfirm()
{
var con=confirm("Are sure want to delete this");
var test;
if(con==false)
{
alert(Bala.Getvalue().value);
}
else
{
alert(Bala.Getvalue1().value);
}
}
</script>
step 4:
in c# page
public partial class Bala : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
Ajax.Utility.RegisterTypeForAjax(typeof(Bala));
//btnsubmit.Attributes.Add("onclick", "Getconfirm();");
}
[Ajax.AjaxMethod()]
public string Getvalue()
{
return "bala";
}
[Ajax.AjaxMethod()]
public string Getvalue1()
{
return "bala1";
}
}
Monday, April 7, 2008
Check if a date is a valid date in Sql Server 2005
Use the ISDATE() function
The ISDATE() function determines whether the variable or the expression contains a valid date. It returns 1(true) if the input expression is a valid date;
otherwise, it returns 0 (false).
For eg:
DECLARE @dt varchar(10)
SET @dt = '02/21/08'
SELECT ISDATE(@dt)-- Returns 1
DECLARE @dt varchar(10)
SET @dt = '13/21/08'
SELECT ISDATE(@dt)-- Returns 0 as 13 is not a valid month
Reset all control values in .NET Web pages.
private void ResetFields()
{
foreach (Control ctrl in this.Controls)
{if (ctrl is TextBox)
{
TextBox tb = (TextBox)ctrl;
if (tb != null)
{ tb.Text = string.Empty;
}
} else
if (ctrl is DropDownList)
{ DropDownList dd = (DropDownList)ctrl;
if (dd != null)
{
dd.SelectedIndex = 0;
}
}
}
How to Show Binary Files in the Browser using ASP.NET and VB.NET
This article explains how to show binary files as well as .doc .xls files in browser. We have seen in many sites that user can open .gif, .jpg, .doc and .xls files by clicking a link. The binary format file as well as .doc .xls is displayed in the browser
1)Create an asp.net web project. Name the project as ShowBinary
2) Add a file of type (.gif,.jpg,.doc,.xls) to the project
3) Specify a Start page for the application4) Use following code snippet in the form load event handler
Private Sub Page_Load(sender as object, e as System.EventArgs)
Response.ContentType = “Application/pdf” ‘ Specify Content Type
Dim fpath as string = Mappath(“Mypdf.pdf”) ‘ Specify Physical Path of the file
Response.writefile(fpath)
End Sub
1)Create an asp.net web project. Name the project as ShowBinary
2) Add a file of type (.gif,.jpg,.doc,.xls) to the project
3) Specify a Start page for the application4) Use following code snippet in the form load event handler
Private Sub Page_Load(sender as object, e as System.EventArgs)
Response.ContentType = “Application/pdf” ‘ Specify Content Type
Dim fpath as string = Mappath(“Mypdf.pdf”) ‘ Specify Physical Path of the file
Response.writefile(fpath)
End Sub
ASP.NET 2.0 MultiView Control
ASP.NET 2.0 Provies a wonderful solution by means of MultiView Control. The MultiView Control combined with the View Control can provide different UI on different scenarios as and when required.
<asp:MultiView ID="MultiView1" runat="server" >
<asp:View ID="View1" runat="server">This is one section where you can have a set of controls / contents<asp:View>
<asp:View ID="View2" runat="server">This is another section where you can have a different set of controls / contents<asp:View>
</asp:MultiView>
Now, to show the different tabs based on different events, we just need to set the following code:-
protected void Button1_Click(object sender, EventArgs e)
{
MultiView1.SetActiveView(View1);
}
protected void Button2_Click(object sender, EventArgs e)
{
MultiView1.SetActiveView(View2);
}
<asp:MultiView ID="MultiView1" runat="server" >
<asp:View ID="View1" runat="server">This is one section where you can have a set of controls / contents<asp:View>
<asp:View ID="View2" runat="server">This is another section where you can have a different set of controls / contents<asp:View>
</asp:MultiView>
Now, to show the different tabs based on different events, we just need to set the following code:-
protected void Button1_Click(object sender, EventArgs e)
{
MultiView1.SetActiveView(View1);
}
protected void Button2_Click(object sender, EventArgs e)
{
MultiView1.SetActiveView(View2);
}
"goto" Using Dotnet framework 2.0
for (int k = 0; k < 2; k++)
{
Response.Write("Testing Goto");
goto Testing;
Testing:
Response.Write("Testing Goto in for loop");
}
output
Testing GotoTesting Goto in for loop
{
Response.Write("Testing Goto");
goto Testing;
Testing:
Response.Write("Testing Goto in for loop");
}
output
Testing GotoTesting Goto in for loop
COALESCE using Sqlserver
I want get employeelist in one single string.
now in new pl/sql version having the COALESCE function,
The magic of function is, it will automatically add "," seprator of employeelist.
///////////////////////////Before COALESCE ///
DECLARE @Emp_UniqueID int,
@EmployeeList varchar(100)
SET @EmployeeList = ''
DECLARE crs_Employees CURSOR
FOR SELECT Emp_UniqueID
FROM SalesCallsEmployees
WHERE SalCal_UniqueID = 1
OPEN crs_Employees
FETCH NEXT FROM crs_Employees INTO @Emp_UniqueID
WHILE @@FETCH_STATUS = 0
BEGIN
SELECT @EmployeeList = @EmployeeList+CAST(@Emp_UniqueID AS varchar(5))+ ', '
FETCH NEXT FROM crs_Employees INTO @Emp_UniqueID
END
SET @EmployeeList = SUBSTRING(@EmployeeList,1,DATALENGTH(@EmployeeList)-2)
CLOSE crs_Employees
DEALLOCATE crs_Employees
SELECT @EmployeeLis
Output:
1, 2, 4
///////////////////////////After COALESCE/////////////
DECLARE @EmployeeList varchar(100)
SELECT @EmployeeList = COALESCE(@EmployeeList + ', ', '') +
CAST(Emp_UniqueID AS varchar(5))
FROM SalesCallsEmployees
WHERE SalCal_UniqueID = 1
SELECT @EmployeeList
Output:1,2,4
/////////////////////////////////////////////////////////////////////////////
now in new pl/sql version having the COALESCE function,
The magic of function is, it will automatically add "," seprator of employeelist.
///////////////////////////Before COALESCE ///
DECLARE @Emp_UniqueID int,
@EmployeeList varchar(100)
SET @EmployeeList = ''
DECLARE crs_Employees CURSOR
FOR SELECT Emp_UniqueID
FROM SalesCallsEmployees
WHERE SalCal_UniqueID = 1
OPEN crs_Employees
FETCH NEXT FROM crs_Employees INTO @Emp_UniqueID
WHILE @@FETCH_STATUS = 0
BEGIN
SELECT @EmployeeList = @EmployeeList+CAST(@Emp_UniqueID AS varchar(5))+ ', '
FETCH NEXT FROM crs_Employees INTO @Emp_UniqueID
END
SET @EmployeeList = SUBSTRING(@EmployeeList,1,DATALENGTH(@EmployeeList)-2)
CLOSE crs_Employees
DEALLOCATE crs_Employees
SELECT @EmployeeLis
Output:
1, 2, 4
///////////////////////////After COALESCE/////////////
DECLARE @EmployeeList varchar(100)
SELECT @EmployeeList = COALESCE(@EmployeeList + ', ', '') +
CAST(Emp_UniqueID AS varchar(5))
FROM SalesCallsEmployees
WHERE SalCal_UniqueID = 1
SELECT @EmployeeList
Output:1,2,4
/////////////////////////////////////////////////////////////////////////////
Anonymous delegate using Dotnet framework 2.0
System.Threading.Thread Th = new System.Threading.Thread(delegate()
{
System.Console.Write("hi");
});
Th.Start();
{
System.Console.Write("hi");
});
Th.Start();
Breaking out a loop in two ways
The two ways described below.
1) firstway is using "break" keyword
2) Second way is using variable declaration.
//First way
for (int i = 0; i < 5; i++)
{
Response.Write("bala");
break;
}
//Second Way
bool br = false;
for (int j = 0; j < 2&& br == false; j++)
{
Response.Write("testingbala");
br = true;
}
1) firstway is using "break" keyword
2) Second way is using variable declaration.
//First way
for (int i = 0; i < 5; i++)
{
Response.Write("bala");
break;
}
//Second Way
bool br = false;
for (int j = 0; j < 2&& br == false; j++)
{
Response.Write("testingbala");
br = true;
}
Nullable DataType in Dotnet Framework 2.0
Nullable Data Type
If you dont have the value for nullable datatype, it will return automatically null as a value.
Example 1:
int? var1 = null;
int var2 = 5;
var1 = var2;
if (var1.HasValue == true) //Using HasValue properties will will findout "var1" variable having value or null.
{
Response.Write("bala");
}
else
{
Response.Write("bala1");
}
Output:
bala
Example 2:
float? a = 436;
float? b = null;
if (a.HasValue) Response.Write("testing");
if (b.HasValue) Response.Write("testi"); else Response.Write("test");
Output:
testingtest
If you dont have the value for nullable datatype, it will return automatically null as a value.
Example 1:
int? var1 = null;
int var2 = 5;
var1 = var2;
if (var1.HasValue == true) //Using HasValue properties will will findout "var1" variable having value or null.
{
Response.Write("bala");
}
else
{
Response.Write("bala1");
}
Output:
bala
Example 2:
float? a = 436;
float? b = null;
if (a.HasValue) Response.Write("testing");
if (b.HasValue) Response.Write("testi"); else Response.Write("test");
Output:
testingtest
Tuesday, March 25, 2008
Calling Javascript in Dotnet based on Button id
In aspx Page
<script language="javascript" type="text/javascript">
function Getconfirm()
{
var con=confirm("Are sure want to delete this");
var test;
if(con==false)
{
alert("test");
}
else
{
alert("test1");
}
}
</script>
<asp:Button ID="btnsubmit" runat="server" OnClick="btnsubmit_Click" />
In C# Page
protected void Page_Load(object sender, EventArgs e)
{
ScriptManager.RegisterClientScriptBlock(btnsubmit, typeof(string), "bala", "Getconfirm();", true);
}
Note:btnsubmit is control id.
<script language="javascript" type="text/javascript">
{
var con=confirm("Are sure want to delete this");
var test;
if(con==false)
{
alert("test");
}
else
{
alert("test1");
}
}
</script>
<asp:Button ID="btnsubmit" runat="server" OnClick="btnsubmit_Click" />
In C# Page
protected void Page_Load(object sender, EventArgs e)
{
ScriptManager.RegisterClientScriptBlock(btnsubmit, typeof(string), "bala", "Getconfirm();", true);
}
Note:btnsubmit is control id.
Monday, March 17, 2008
Windows Communication Foundation
WCF-Windows Communication Foundation
WCF is nothing but a Distributed system. Combination of Object Oriented Architechtre and Service Oriented Architecture.
NET 3.0 comes with three main technologies in core: Windows Presentation Foundation, Windows Workflow Foundation and Windows Communication Foundation.
Windows Communication Foundation (WCF), codenamed Indigo in Microsoft, is the last generation of service oriented technologies for development. It provides all the latest means to help developers build service oriented applications. The result of service oriented design is a distributed system which runs between services and clients. Windows Communication Foundation is Microsoft infrastructure for Service Oriented architecture
Advantages
Windows Communication Foundation has some important enhancements in comparison with preceding technologies·
. It merges all older separate technologies in one place and allows you to do things easier.
· It has rich communication capabilities.
· It comes with many powerful and ready to use enterprise features.
· It can be integrated with other technologies and has great interoperability.
Architecture of Windows Communication Foundation consists of five layers. These layers from top to down are:
· Application: In this level application is located.
· Contracts: In the second layer service, data and message contracts as well as bindings and policies are present. In this level services describe themselves to clients.
· Runtime: Behaviors are located in this layer. Runtime layer loads all services.
· Messaging: Different types of channels as well as encoders are here. This layer enables communications for services.
· Hosting: This layer is where host services in different manners, but there are two common ways to host a service. You can host a service in Internet Information Services (IIS) which is easier than the second approach and starts and stops your services automatically. The second approach is to create executable files (.EXE) for services and start and stop them manually by writing more codes.
WCF is nothing but a Distributed system. Combination of Object Oriented Architechtre and Service Oriented Architecture.
NET 3.0 comes with three main technologies in core: Windows Presentation Foundation, Windows Workflow Foundation and Windows Communication Foundation.
Windows Communication Foundation (WCF), codenamed Indigo in Microsoft, is the last generation of service oriented technologies for development. It provides all the latest means to help developers build service oriented applications. The result of service oriented design is a distributed system which runs between services and clients. Windows Communication Foundation is Microsoft infrastructure for Service Oriented architecture
Advantages
Windows Communication Foundation has some important enhancements in comparison with preceding technologies·
. It merges all older separate technologies in one place and allows you to do things easier.
· It has rich communication capabilities.
· It comes with many powerful and ready to use enterprise features.
· It can be integrated with other technologies and has great interoperability.
Windows Communication Foundation consists of three main concepts.
· Services: Programs that respond to clients. They can send or receive messages.
· Clients: Programs that ask for a service. They can send or receive messages.
· Intermediaries: Programs that sit between services and clients (Figure 2). They can work as a firewall or can rout messages. In all cases neither services nor clients need to be aware of intermediaries.
Architecture of Windows Communication Foundation consists of five layers. These layers from top to down are:
· Application: In this level application is located.
· Contracts: In the second layer service, data and message contracts as well as bindings and policies are present. In this level services describe themselves to clients.
· Runtime: Behaviors are located in this layer. Runtime layer loads all services.
· Messaging: Different types of channels as well as encoders are here. This layer enables communications for services.
· Hosting: This layer is where host services in different manners, but there are two common ways to host a service. You can host a service in Internet Information Services (IIS) which is easier than the second approach and starts and stops your services automatically. The second approach is to create executable files (.EXE) for services and start and stop them manually by writing more codes.
Windows Communication Foundation has simple and easy to write/understand codes. It has many APIs, but beside this only a small amount of these API's is common.
There are three programming approaches in Windows Communication Foundation:
· Imperative: You use programming codes in different languages to accomplish a task.
· Configuration Based: You use configuration files to do things.
· Declarative: You use attributes to declare something.
On the other hand, you can use typed services and untyped services. In typed services you pass normal objects and data types and/or get normal objects and data types, but in untyped services you pass and get messages to work directly with messages at a lower level..
Installation
Installation of Windows Communication Foundation and its development tool is easy and consists of these steps:
· Download and install .NET Framework 3.0 RTM. I also strongly recommend you to download and install WinFX SDK as well. After this step you have all necessary API's to run Windows Communication Foundation.
· Download and install Visual Studio 2005xtensions for .NET Framework 3.0 WCF and WPF). After installing this package, you will have new project templates in your Visual Studio to start developing for Windows Communication Foundation
Sunday, March 16, 2008
verbatim literal
Another useful feature of C# strings is the verbatim literal
which is a string with a @ symbol prefix, as in @"Some string". Verbatim literals make escape sequences translate as normal characters to enhance readability. To appreciate the value of verbatim literals, consider a path statement such as "c:\\topdir\\subdir\\subdir\\myapp.exe". As you can see, the backslashes are escaped, causing the string to be less readable. You can improve the string with a verbatim literal, like this: @"c:\topdir\subdir\subdir\myapp.exe".
Cracking .NET Assemblies
Cracking .NET Assemblies
This is nice articale for cracking the .net assemblies
http://www.grimes.demon.co.uk/workshops/fusionWSCrackThree.htm#Cracking_Whidbey_Assemblies
This is nice articale for cracking the .net assemblies
http://www.grimes.demon.co.uk/workshops/fusionWSCrackThree.htm#Cracking_Whidbey_Assemblies
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