ASP.NET Tutorials

Here is the code snippet to obtain the IP Address and Referer of a visitor to your website

Dim IPAddress=Request.ServerVariables(”REMOTE_ADDR”)
Dim Referer=Request.ServerVariables(”HTTP_REFERER”)

Check a demo here
Check my IP

There are lot of times we accept user input in a textarea or a multiline textbox and save it to a database. But while displaying the data from the database, you will find that the line breaks are not displayed properly, infact there will be no line breaks. We will need to convert all the [...]

The Gridview Control in ASP.NET has built in paging support. But here are a few disadvantages of using the built in paging

It fetches all the records from the database even when we need only 10 records per page. This is quite inefficient when your tables have thousands of records
The paging controls uses javascript which [...]

Suppose you have a label control name lblMessage in your masterpage and you want to access the label control from one of your pages, you can do so using the following code

Ctype( Page.Master.FindControl(”lblMessage”),Label).Text = “Hello”

Many people have problems inserting flash files in masterpages . The following code is the correct way of inserting flash file in a mastepage . It will work in all situations

<object classid=”clsid:D27CDB6E-AE6D-11cf-96B8-444553540000″ codebase= “http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=7,0,19,0” width=”663″ height=”105″ title=”Serious Reading….”>
<param name=”movie” value=’<%= Request.ApplicationPath + “main_anim.swf” %>’
<param name=”quality” value=”high” />
<embed src=’<%= Request.ApplicationPath + “main_anim.swf” %>’ pluginspage=”http://www.macromedia.com/go/getflashplayer” type=”application/x-shockwave-flash” width=”663″ [...]

To format a gridview column to display dates properly , two properties needs to be changed, the DateFormatString property and the HTML encode property. After setting the DateFormatString the HTMLEncode property should be set to false. For Example :

<asp:BoundField DataField=”RegistrationDate” DataFormatString=”{0:MM/dd/yyyy}” HeaderText=”Date”
HtmlEncode=”False” SortExpression=”RegistrationDate” />

In some scenarios you may only want users of a particular role to delete records from the GridView. So you need a mechanism to disable/hide the delete link in the gridview based on roles. The code below will enable the delete link only for “Admin” roles and disable it for the rest.

Protected [...]

<%=ServerControlID.ClientID%>
Yes that’s all you need . For Example suppose you have a asp.net textbox server control whose ID is “Textbox1″ . In your javascript code to get the value of the control you will use something like this

var myValue= document.getElementById(’<%=TextBox1.ClientID%>’).value;