Multiple PostBack problem with GridView

I noticed my SelectedIndexChanged method being called twice in IE7 when I selected a gridview row. I used solution 2 at http://www.codeproject.com/KB/aspnet/GVImageCommandButtonProb.aspx to solve the problem.

Resetting a StringBuilder

Here is how to reset a StringBuilder:

myStringBuilder.Length = 0;

myStringBuilder.Remove(0, myStringBuilder.Length) also works, but why bother with that one?
References: http://forums.asp.net/t/1193708.aspx

Creating a GUID from scatch

Sometimes you might want a psuedo-random string value. This can be done with:
System.Guid.NewGuid().ToString();

Changing the default login page for use with LoginStatus control

Sometimes it is desirable to have a different default login page. For example, a simple site where administrators login at http://foo.com/admin/Login.aspx versus the standard http:foo.com/Login.aspx. The LoginStatus control will hyperlink back to the default login page. To change this default login page, change the web.config file as follows:

    <authentication mode="Forms" >
      <forms loginUrl="~/admin/Login.aspx"></forms>
    </authentication>

Reference: http://erlend.oftedal.no/blog/?blogid=55

How to trim a string in javascript

How to trim a string in javascript:

var trimmed = str.replace(/^\s+|\s+$/g, '') ;

Reference: http://www.nicknettleton.com/zine/javascript/trim-a-string-in-javascript

Reading TextBox or other Control values with javascript

Reading TextBox or other Control values with javascript.
Assume TextBox ID="txtName"
First, there are the simple examples of a standard aspx page:

<script type="text/javascript" languague="javascript">
   function simple1() {
      var txtVal = $get('<%= txtName.ClientID %>').value;
   }
   function simple2() {
      var txtVal = $document.getElementById('<%= txtName.ClientID %>').value;
   }
</script>

Here is the complex sample used for accessing a MasterPage's updatePanel for example:

// In the ASPX class
private string scriptKey = "alertName";
private string script = "function alertName() { var txt = document.getElementById('[txtNameID]'); alert(txt.value); }"; 

// In the Page_Load event
script = script.Replace("[txtNameID]", txtName.ClientID);
ClientScript.RegisterClientScriptBlock(this.Page.GetType(), scriptKey, script, true); 

references: http://www.velocityreviews.com/forums/t109803-callback-manager-masterpage.html

const and static declarations

const and static declarations cannot be declared together because they are always together when marked const.
Reference: http://blogs.msdn.com/csharpfaq/archive/2004/03/12/88416.aspx