filter datagrid by textbox

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C#3.0

C#

Dear Experts i m using this code for filter datagrid row value by the textchanged but it not running in proper way :-

private void tbSearchText_TextChanged(object sender, EventArgs e)
        {

            Friends.con.Open();
           str = "SELECT EmployeeName  From Admin ";
                cmd = new OleDbCommand(str, Friends.con);
                OleDbDataAdapter da = new OleDbDataAdapter(cmd);
                DataTable dtEmployee = new DataTable();
                da.Fill(dtEmployee);

                if (dtEmployee.Rows.Count > 0)
            {
                dtEmployee.DefaultView.RowFilter = "EmployeeName Like '" + tbSearchText.Text + "*'";
                dtEmployee.DefaultView.Sort = "EmployeeName";
                DGVEmployeeResult.ClearSelection();
            }
            Friends.con.Close();
                
        }

I m Using Window Form I have a gridview i want to filter row of gridview by the textbox changed letter which i entered ...............it is not working