select values from combobox1 and combobox2 and show the datagridview1

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Windows

C#3.5

hello friends i need one help
i am using one window a application with c#.i have two Comboboxs

Combobox1(CB1) and Comboboxs2(CB2).both are already attached with datafields.be
i want when i select the value one from CB1 and second value CB2 then datagridview1 should be display .
my codes are

try
{


con = new SqlConnection("Data Source=.;Initial Catalog=DSIIDC2;Integrated Security=True");
con.Open();
string str = "select * from addcaasedetails";

SqlDataAdapter da = new SqlDataAdapter(str, con);
DataSet ds = new DataSet();
da.Fill(ds);
foreach (DataRow row in ds.Tables[0].Rows)
{
if (ds.Tables[0].Rows[1]["caseno"] == comboBox1.SelectedItem && ds.Tables[0].Rows[1]["caseno"]==comboBox2.SelectedItem)
{
dataGridView1.Visible = true;
}

}

}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}