How to design the output in ASP.Net4, SQL2008

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ASP.NET

SQL-Server

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Friends, my Code for search data from sql 2008 database with asp.net4 using EF like this:

public List<string> GetSearchPCs()
{
    List<string> SLNo = new List<string>();
    using (PCEntities myEntity = new PCEntities())
    {
        var data = from s in myEntity.ItemSets where s.PCSLNo.Contains(txtSearch.Text) select s;
        foreach (var s in data)
        {
            S PCSLNO.Add(s.SlNo + " " + s.MonitorSlNo + " " + s.SNo);
        }
        return SLNo;
    }
}
//Next, just I need to bind this function to a data control:
protected void txtSearch_TextChanged(object sender, EventArgs e)
{
    GridView1.DataSource = GetSearchPCs();
    GridView1.DataBind();
}

Now I need to design the GridView columns but unable to do so. Please help me how to do it with GridView or Repeater etc. Waiting for solution from you all friends. Thank You