ASP.NET

DataTable dt = new DataTable();

     dt.Columns.Add();
     dt.Columns[0].ColumnName = "User Name";
     dt.Columns.Add();
     dt.Columns[1].ColumnName = "User Email";

     foreach (GridViewRow row in SearchGrid.Rows) // SearchGrid is the name of the Grid.
     {

         DataRow dr = dt.NewRow();
         dr["User Name"] = row.Cells[1].Text;
         dr["User Email"] = row.Cells[2].Text;
         dt.Rows.Add(dr);
     }