SQL Server :: How To Keep Column Values Unique

Aug 7, 2010

I know this is a newbie question but, alas , that's what I am. How do I keep values in specifc sql server table unique, in other words how do I prevent any duplicates happening upon creating (inserting) a new table row?

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[Code]....

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
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[code]...

This is the code of the second page Default.aspx.cs where i have to user the session varaible to pass in the SQL fucntion named GetDataByUserId as shown below:

using System;
using System.Collections.Generic;
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using System.Web;
using System.Web.UI;
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[Code] ....

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protected void Page_Load(object sender, EventArgs e)
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[Code]....

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