how can count datagrid recoard

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C#

private void button4_Click(object sender, EventArgs e)
            {
                if (txtcombo.Text == "Form ID")
                { 
                    label1.Hide();
                    Global.Open_DataConn("doc", "conData");
                    OleDbDataAdapter da = new OleDbDataAdapter("SELECT WCDCH.formid, WCDCH.surname, WCDCH.firstname, WCDCH.midname, WCDCH.ttransid FROM WCDCH INNER JOIN bankdata ON WCDCH.formid = bankdata.formid", Global.conData);
                    DataSet ds = new DataSet();
                    da.Fill(ds);
                    dataGridView1.DataSource = ds.Tables[0];
                    label2.Show();
label3.Text = dataGridView1.RowCount.ToString();
                }
                else if (txtcombo.Text == "TransactionID")
                {
                    label2.Hide();
                    Global.Open_DataConn("doc", "conData");
                    OleDbDataAdapter da = new OleDbDataAdapter("SELECT WCDCH.formid, WCDCH.surname, WCDCH.firstname, WCDCH.midname, WCDCH.ttransid FROM WCDCH INNER JOIN bankdata ON WCDCH.ttransid = bankdata.ttransid", Global.conData);
                    DataSet ds = new DataSet();
                    da.Fill(ds);
                    dataGridView1.DataSource = ds.Tables[0];
                    label1.Show();
label3.Text = dataGridView1.RowCount.ToString();
                }
                else
                {
                    MessageBox.Show("Please,Select which you want");
                }
            }

i have done the get matching record from the database in datagrid now i need to count the result shown in the datagrid..