How to display Searched Records in Highlight way inside GRIDVIEW ?

protected void Button1_Click(object sender, EventArgs e)

{

string searchString = txtSearch.Text;

StringBuilder sb = new StringBuilder();

DataTable dt = new DataTable();

List<GridViewRow> rows = new List<GridViewRow>(); 

 

foreach (GridViewRow row in GridView1.Rows)

{

TableCellCollection cells = row.Cells;

foreach (TableCell cell in cells)

{

if (cell.Text.ToLower().StartsWith(searchString.ToLower()))

{

cell.BackColor = System.Drawing.Color.Yellow;


foreach (TableCell c in cells)

{

sb.Append(c.Text);


}


sb.Append("<BR>"); 


}

else

{

cell.BackColor = System.Drawing.Color.White;

}

}

}
}