Check for Column existence in a C# DataTable

DataTable dtTest = new DataTable();
dtTest.Columns.Add("Test1");
dtTest.Columns.Add("Test2");
dtTest.Columns.Add("Test3");
Response.Write(dtTest.Columns.Contains("Test")); // returns false;
Response.Write(dtTest.Columns.Contains("Test2")); // returns true;

Redirection in c#

Response.Redirect("http://google.com");

Rename a Column in C# DataTable

Consider you have DataTable(dtUser) with 3 columns(ID, NAME, DESC)
if you want to change column name 'DESC' to 'DESCRIPTION',

dtUser.Columns[2].ColumnName="DESCRIPTION";

Time Zone Drop down using C#.NET

TimeZoneInformation[] arrTzi = TimeZoneInformation.EnumZones();
ddlTimeZone.DataSource = arrTzi; //ddlTimeZone is id of the asp:dropdownlist
ddlTimeZone.DataBind();