Delete datagridview row from database without event

I have a datagridview and I successfully am able to add and edit rows in my datagridview to sql database table. However , I'm having some trouble with delete. I COULD add a column with a delete checkbox option or use the UserDeletingRow event, but the way I have it set up, I would have to restructure my program and I'm trying to avoid that.

Here's what I did for the add and edit, and started the delete:

private void button1_Click(object sender, EventArgs e)
        {
            SqlCommand cmdAdd = new SqlCommand("insert into Josh_REL_Table (UserID, RoleName) Values (@UserID,@RoleName)", con);
            SqlCommand cmdEdit = new SqlCommand("update Josh_Rel_Table SET UserID = @UserId, RoleName=@RoleName where RelationID=@RelationID", con);
            SqlCommand cmdDelete = new SqlCommand("delete from Josh_Rel_Table where RelationID = @RelationID", con);

        con.Open();
        cmdAdd.Parameters.Add("@UserID", SqlDbType.VarChar);
        cmdAdd.Parameters.Add("@RoleName", SqlDbType.VarChar);
        cmdAdd.Parameters.Add("@RelationID", SqlDbType.VarChar);

        cmdEdit.Parameters.Add("@UserID", SqlDbType.VarChar);
        cmdEdit.Parameters.Add("@RoleName", SqlDbType.VarChar);
        cmdEdit.Parameters.Add("@RelationID", SqlDbType.VarChar);

        cmdDelete.Parameters.Add("@RelationID", SqlDbType.VarChar);
        if (DGV1.RowCount >= 1)
        {
            for (int x = 0; x < DGV1.RowCount - 1; x++)
            {
                if (DGV1.Rows[x].Cells[0].Value.ToString() == "" || DGV1.Rows[x].Cells[0].Value == null)
                {
                    cmdAdd.Parameters["@UserID"].Value = DGV1.Rows[x].Cells[1].Value.ToString();
                    cmdAdd.Parameters["@RoleName"].Value = comboBox1.Text;
                    cmdAdd.Parameters["@RelationID"].Value = DGV1.Rows[x].Cells[0].Value.ToString();
                    cmdAdd.ExecuteNonQuery();
                }
                if (!DGV1.Rows[x].IsNewRow)
                {
                    cmdEdit.Parameters["@UserID"].Value = DGV1.Rows[x].Cells[1].Value.ToString();
                    cmdEdit.Parameters["@RoleName"].Value = comboBox1.Text;
                    cmdEdit.Parameters["@RelationID"].Value = DGV1.Rows[x].Cells[0].Value.ToString();
                    cmdEdit.ExecuteNonQuery();
                }
                if ()
                {
                     //Deleting a row

                }
            }



            MessageBox.Show("Record updated!");
            con.Close();
        }
    }

If I were to use the event, it would be something like this....

  private void DGV1_UserDeletingRow(object sender, DataGridViewRowCancelEventArgs e)
        {
            SqlCommand cmdDelete = new SqlCommand("delete from Josh_Rel_Table where RelationID=@RelationID", con);
            cmdDelete.Parameters.Add("@RelationID", SqlDbType.VarChar);
            foreach (DataGridViewRow row in DGV1.SelectedRows)
            {
                if (!row.IsNewRow)
                {
                    DGV1.Rows.Remove(row);
                    cmdDelete.Parameters["@RelationID"].
                    cmdDelete.ExecuteNonQuery();
                }
            }
        }

"keycode" and "handled" are invalid in trying something like:

if (e.KeyCode == Keys.Delete && DGV1.CurrentCell.Selected)
                    {
                        DGV1.CurrentCell.Value = null;
                        e.Handled = true;
                    }

So how can I put the pieces together?