Get selected datagridview cell

Hi,

I have an event written when the user clicks on a row in a datagridview.  I want to refer to the value of the first cell in the row in a parameterized query and use that to place in another datagridview.  I have never done this before, so I'm not sure of the syntax to place the selected cell's content in the parameterized query .addwithvalue statement.

Here's some code:

private void gridCall_CellContentClick(object sender, DataGridViewCellEventArgs e)
        {
           // string str;
           // str = gridCall.Rows[gridCall.SelectedRows[0].Index].Cells[1].Value.ToString();
           // string str = gridCall.SelectedRows[0].Cells[0].Value.ToString();
       //  string str = gridCall.CurrentCell;

            con = new SqlConnection("server=###;database=###;Initial Catalog=###;uid=###;pwd=###");

            queryString = "select a.note from cadnote a inner join callhist b on a.incidentno = b.incidentno where a.incidentno = @incidentno";
            DataTable table = new DataTable("DVNotesTable");

            using (SqlConnection myConnection = con)
            {
                using (SqlCommand sqlComm = new SqlCommand(queryString, con))
                {
                    sqlComm.Parameters.AddWithValue("@incidentno", ?????);
                    sqlComm.CommandType = CommandType.Text;

                    using (SqlDataAdapter da = new SqlDataAdapter(sqlComm))
                    {
                        try
                        {
                            myConnection.Open();
                            da.Fill(table);
                            gridNotes.DataSource = table;
                        }

                        catch (Exception ex)
                        {
                            MessageBox.Show("Error: " + ex.Message, "Connection error", MessageBoxButtons.OK, MessageBoxIcon.Error);
                        }
                        finally
                        {
                            myConnection.Close();
                        }
                    }
                }
            }
        }

As you can see, at the beginning of the click event I have tried a few things but when I plug them into the parameterized query I get an error "index out of range".  How do I refer to the selected cell value in the parameterized query .addwithvalue line (where I have just put ???? for the time being)?

Greatly appreciate your help.  Thank you.