filtering datagrid using combobox - c#-3.0

Question

I had created a datagridview like this
public void gridviewsetup()
{
tbl_Aplication.Columns.Add("1", "Empid");
tbl_Aplication.Columns.Add("2", "Emp no");
tbl_Aplication.Columns.Add("3", "Emp Name");
tbl_Aplication.Columns.Add("4", "Department ");
tbl_Aplication.Columns.Add("5", "Designation");
tbl_Aplication.Columns.Add("6", "Shift");
tbl_Aplication.Columns.Add("7", "Start Time");
tbl_Aplication.Columns.Add("8", "End Time");
tbl_Aplication.Columns.Add("9", "OT");
tbl_Aplication.Columns.Add("10", "Reversed Swipe Out");
tbl_Aplication.RowTemplate.Height = 18;
}
and i had populated a data table to fill the data dgridview
public void filldatagrid()
{
if (cmb_dept.Text.Trim() != "")
{
Datatable employedata = empreg.getallemployeeshiftdetails(int.Parse(cmb_dept.SelectedValue.ToString()), Program.LOCTNPK);
tbl_Aplication.Rows.Clear();
tbl_Aplication.DataSource = null;
for (int i = 0; i < employedata.Rows.Count; i++)
{
tbl_Aplication.Rows.Add();
tbl_Aplication.Rows[i].Cells[1].Value = employedata.Rows[i][0];
tbl_Aplication.Rows[i].Cells[2].Value = employedata.Rows[i][1];
tbl_Aplication.Rows[i].Cells[3].Value = employedata.Rows[i][2];
tbl_Aplication.Rows[i].Cells[4].Value = employedata.Rows[i][3];
tbl_Aplication.Rows[i].Cells[5].Value = employedata.Rows[i][4];
tbl_Aplication.Rows[i].Cells[6].Value = employedata.Rows[i][5];
tbl_Aplication.Rows[i].Cells[7].Value = employedata.Rows[i][6];
tbl_Aplication.Rows[i].Cells[8].Value = employedata.Rows[i][7];
tbl_Aplication.Rows[i].Cells[9].Value = 0;
tbl_Aplication.Rows[i].Cells[10].Value = employedata.Rows[i][7];
}
}
}
now i want to filter data in the datagrid with the designation selected in the combobox without going back to database ,I did it like this but it shows error
private void cmb_designation_SelectedIndexChanged(object sender, EventArgs e)
{
if (desgflag != 0)
{
if (cmb_dept.SelectedValue!=null )
{
// tbl_Aplication.DataSource = employedata;
((DataTable)tbl_Aplication.DataSource).DefaultView.RowFilter = " designationnName like '%" + cmb_dept.Text.Trim() + "%' ";
}
}
}

Answer 1

I had done it
private void cmb_department_SelectedIndexChanged(object sender, EventArgs e)
{
try
{
if (cmb_department.Text.Trim() == "" || cmb_department.Text.Trim() == null)
{
tbl_DestinationData.DataSource = dt;
}
else
{
((DataTable)tbl_DestinationData.DataSource).DefaultView.RowFilter = " Dept like '%" + cmb_department.Text.Trim() + "%' ";
}
}
catch (Exception )
{
throw;
}
}