get the combobox values from the row of the table and match

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C#

C#4.0

application

, +

hello friends i am making one window base application
now i have struck somewhere thats why i need help from you experts.

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);

    for (int i = 0; i < ds.Tables["addcaasedetails"].Rows.Count; i++)
    {
        if (ds.Tables["addcaasedetails"].Rows[i]["caseno"] == casedetails.ValueMember)
        {
            dataGridView1.Visible = true;
        }
    }

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

i want to get value form the row and match from the combobox.please find where i am wrong in this code. please make it crrect