C# winform c中的Mdi表单#使用sql server 2008

我想检索mdi子窗体中的数据，但代码不起作用。它对我的mdi子窗体没有任何值

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请帮助我如何将数据检索到mdi子表单

您可以将子表单所需的数据传递给frmCustomerDetails构造函数——在这种情况下，您应该在frmCustomerDetails类中定义自定义构造函数。 或者，您可以在frmCustomerDetails类中创建自定义Show方法，并在该方法中传递数据。在frmCustomerDetails类中，将传递的数据存储在私有字段中和/或将数据绑定到控件

因此，在frmCustomerDetails类中，它可以如下所示：

frmCustomerDetails cd;
private void dataGridView1_RowHeaderMouseClick(object sender, DataGridViewCellMouseEventArgs e)
{
    try
    {
        DataGridViewRow dr = dataGridView1.SelectedRows[0];
        this.Hide();
        frmDairyManagementSystem cda = new frmDairyManagementSystem();
        //cd.Show();

        if (cd == null || cd.IsDisposed)
        {


            cd = new frmCustomerDetails();
            cd.MdiParent = cda;
            cd.WindowState = FormWindowState.Maximized;
            cd.Show();
        }
        else
            cd.Activate();
        //frmCustomerDetails frm = new frmCustomerDetails();
        //frm.Show();
        cd.txtCustomerID.Text = dr.Cells[0].Value.ToString();
        cd.dateTimePicker1.Text = dr.Cells[1].Value.ToString();
        cd.txtCustomerName.Text = dr.Cells[2].Value.ToString();
        cd.grpGender.Text = dr.Cells[3].Value.ToString();
        cd.txtAddress.Text = dr.Cells[4].Value.ToString();
        cd.txtPhone.Text = dr.Cells[5].Value.ToString();
        cd.txtEmail.Text = dr.Cells[6].Value.ToString();
        cd.txtMobileNo.Text = dr.Cells[7].Value.ToString();
        cd.txtNotes.Text = dr.Cells[8].Value.ToString();
        cd.btnUpdate.Enabled = true;
        cd.btnDelete.Enabled = true;
        cd.btnSave.Enabled = false;
        cd.txtCustomerName.Focus();
    }
    catch (Exception ex)
    {
        MessageBox.Show(ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
    }
}

void Show(DataGridViewRow dr)
{
    //TODO: Store cell values from dr to private fields and/or bind them to controls
    this.MdiParent = cda;
    this.WindowState = FormWindowState.Maximized;
    this.Show();
}