retrieving the data base in to data grid view using csharp

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C#

i tried but it is not working.

Faculty Code combo box view(Button)


private void Btn_View_Course_Click(object sender, EventArgs e)
{
sql = "select Date,Session,Course from Tb_SCh_TIme_Table where Faculty_Code= ' " + Cb_Faculty_Code.Text + "'order by Date,session ";


DataTable dt = new DataTable();
SqlDataAdapter da = new SqlDataAdapter(sql, con);
SqlCommandBuilder cmd = new SqlCommandBuilder(da);
da.Fill(dt);
dataGridView1.DataSource = dt;
}

in the data base records are there.

when i select the Faculty_Code and click the View Button .the particular Faculty_Code details want to display in datagridview1.

select the Faculty_Code and click the view (Button).

in the datagridview1 the Faculty_Code details is not display in the data grid view.

from my code wat is the mistake.how can i do.