How to pass value from one form to another form's dynamically created control

Question

Suppose I have two forms i.e Form1 and Form2. Form1 contains dynamically created DataGridView control and Form2 contains two Textbox controls (Textbox1 and Textbox2) and a Button control.

When I DoubleClick on the DataGridView's cell it will open Form2 and the data from current selected cell passes to Form2's Textbox1

Here is the code:

I Added a handlear to my dynamically created DatagridView like this:

    AddHandler dg.CellMouseDoubleClick, AddressOf dg_DataGridEdit

    Private Sub dg_DataGridEdit(ByVal sender As Object, ByVal e As System.Windows.Forms.DataGridViewCellMouseEventArgs)
                Dim dgView As DataGridView = DirectCast(sender, DataGridView)
        Form2.TextBox1.Text = dgView.CurrentCell.Value.ToString()
                Form2.ShowDialog()
    End Sub

When i click on the button from Form2, the value of current selected cell will change like TextBox2 from Form2 has. But the problem is i can't use the code from button1 from From2 like

    Form1.dgView.CurrentCell.Value = TextBox2.Text

How can i pass value from textbox2 to current selected cell?

Answer 1

When you create your DataGridView, store a reference to it:

private _myDgv as DataGridView

Sub Form_load
    _myDgv = New dataGridView
    Me.Controls.Add(_myDgv)
    'etc.
End Sub

Then Add a ReadOnly Property to get a reference to it from elsewhere:

Public ReadOnly Property DynamicDgv As DataGridView
    Get
        Return _myDgv
    End Get
End Property

Then you can do this in Form2:

Form1.DynamicDgv.CurrentCell.Value = TextBox2.Text

Answer 2

I would not use the default instances. Here is an example that uses a textbox on each form:

form1

Public Class Form1

    Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
        Dim f As New Form2(TextBox1F1) 'pass ref to form2
        f.ShowDialog()
    End Sub
End Class

form2

Public Class Form2

    Dim txtbox As TextBox

    Public Sub New(tb As TextBox)

        ' This call is required by the designer.
        InitializeComponent()

        ' Add any initialization after the InitializeComponent() call.
        txtbox = tb 'get ref from calling form
    End Sub

    Private Sub Form2_Shown(sender As Object, e As EventArgs) Handles Me.Shown
        TextBox1F2.Text = txtbox.Text
    End Sub

    Private Sub TextBox1_TextChanged(sender As Object, e As EventArgs) Handles TextBox1F2.TextChanged
        txtbox.Text = TextBox1F2.Text
    End Sub
End Class

Any changes to the textbox on form2 will be reflected in the textbox on form1.

Answer 3

Try copying to clipboard as a workaround so you don't have to pass the text from one method to the next

System.Windows.Forms.Clipboard.SetText(...)

System.Windows.Forms.Clipboard.GetText(...)

Answer 4

Ok I got it. At first i have created a public variable called

    Public UpdateData As String = ""

Then change the code-

    Private Sub dg_DataGridEdit(ByVal sender As Object, ByVal e As System.Windows.Forms.DataGridViewCellMouseEventArgs)

                Dim dgView As DataGridView = DirectCast(sender, DataGridView)
                Form2.TextBox1.Text = dgView.CurrentCell.Value.ToString()
                Form2.ShowDialog()
                dgView.CurrentCell.Value =UpdateData
                UpdateData=""
    End Sub

In form2

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        form1.UpdateData = TextBox2.Text
        Me.Hide()
    End Sub

Answer 5

You may pass the datagridview of Form1 to Form2 through Form2's constructor. Then you'll be able to access the CurrentCell of the datagridview of Form1 as like your last code snippet.

You can have a constructor in Form2 which'll take the datagridview as argument.

Public Class Form2

    Private dgView As New DataGridView
    Public Sub New(ByRef _dgView As DataGridView)
        dgView = _dgView
    End Sub

End Class

When you create the instance of Form2 in Form1, pass the dgView to Form2 like:

Public Class Form1
    Dim Form2 As New Form2(dgView)

End Class

Now when you click the button in Form2, just set the CurrentCell of the dgView in the button event handler like:

dgView.CurrentCell.Value = TextBox2.Text