Pass data from Windows Form DataGridView to Child MDI Form using C#

Hi Bhavesh23,

You need to check the ActiveMdiChild. If it is not null then close it first before opening the new one.

Please refer below sample.

Note: For this sample i have used temporary DataTable. For more details refer How to create Temporary Table in ASP.Net using C# and VB.Net.

Namespace

C#

using System.Data;

VB.Net

Imports System.Data

Code

C#

Form1

public Form1()
{
    InitializeComponent();
    this.BindDataGridView();
    this.IsMdiContainer = true;
}

private void BindDataGridView()
{
    DataTable dt = new DataTable();
    dt.Columns.AddRange(new DataColumn[3] {
                        new DataColumn("Id"),
                        new DataColumn("Name"),
                        new DataColumn("Country") });
    dt.Rows.Add(1, "John Hammond", "United States");
    dt.Rows.Add(2, "Mudassar Khan", "India");
    dt.Rows.Add(3, "Suzanne Mathews", "France");
    dt.Rows.Add(4, "Robert Schidner", "Russia");
    dgvCustomers.DataSource = dt;
}

public static DataGridViewRow SelectedRow { get; set; }
private void OnCellMouseClick(object sender, DataGridViewCellMouseEventArgs e)
{
    if (e.RowIndex >= 0)
    {
        if (ActiveMdiChild != null)
        {
            ActiveMdiChild.Close();
        }
        SelectedRow = dgvCustomers.Rows[e.RowIndex];
        Form2 frm = new Form2();
        frm.MdiParent = this;
        frm.Show();
    }
}

Form2

public Form2()
{
    InitializeComponent();
}

private void Form2_Load(object sender, EventArgs e)
{
    txtId.Text = Form1.SelectedRow.Cells[0].Value.ToString();
    txtName.Text = Form1.SelectedRow.Cells[1].Value.ToString();
    txtCountry.Text = Form1.SelectedRow.Cells[2].Value.ToString();
}

VB.Net

Form1

Public Sub New()
    InitializeComponent()
    Me.BindDataGridView()
    Me.IsMdiContainer = True
End Sub

Private Sub BindDataGridView()
    Dim dt As DataTable = New DataTable()
    dt.Columns.AddRange(New DataColumn(2) {New DataColumn("Id"), New DataColumn("Name"), New DataColumn("Country")})
    dt.Rows.Add(1, "John Hammond", "United States")
    dt.Rows.Add(2, "Mudassar Khan", "India")
    dt.Rows.Add(3, "Suzanne Mathews", "France")
    dt.Rows.Add(4, "Robert Schidner", "Russia")
    dgvCustomers.DataSource = dt
End Sub

Public Shared Property SelectedRow As DataGridViewRow

Private Sub OnCellMouseClick(ByVal sender As Object, ByVal e As DataGridViewCellMouseEventArgs) Handles dgvCustomers.CellMouseClick
    If e.RowIndex >= 0 Then

        If ActiveMdiChild IsNot Nothing Then
            ActiveMdiChild.Close()
        End If

        SelectedRow = dgvCustomers.Rows(e.RowIndex)
        Dim frm As Form2 = New Form2()
        frm.MdiParent = Me
        frm.Show()
    End If
End Sub

Form2

Public Sub New()
    InitializeComponent()
End Sub

Private Sub Form2_Load(ByVal sender As Object, ByVal e As EventArgs) Handles MyBase.Load
    txtId.Text = Form1.SelectedRow.Cells(0).Value.ToString()
    txtName.Text = Form1.SelectedRow.Cells(1).Value.ToString()
    txtCountry.Text = Form1.SelectedRow.Cells(2).Value.ToString()
End Sub

Screenshot