i want to copy rows from one datagridview in form1 to another datagridview in form2
please help me !!

Hi Sir teze;

Addition Information:

I suggest use RowHeaderMouseDoubleClick on the event of DGV

Note: doubleclick the row of DGV1, it transfer the whole row to DGV2

Private Sub dgvEF_RowHeaderMouseDoubleClick(ByVal sender As System.Object, ByVal e As System.Windows.Forms.DataGridViewCellMouseEventArgs) Handles dgvEF.RowHeaderMouseDoubleClick


For rowIndex As Integer = 0 To (Me.ReadDataDataGridView.Rows.Count - 1)
If (Not Me.ReadDataDataGridView.Rows(rowIndex).IsNewRow) Then

    Dim values As Object() = New Object(Me.ReadDataDataGridView.Columns.Count - 1) {}

    For columnIndex As Integer = 0 To (Me.ReadDataDataGridView.Columns.Count - 1)
        values(columnIndex) = Me.ReadDataDataGridView.Rows(rowIndex).Cells(columnIndex).Value
    Next

    Me.DataGridView1.Rows.Add(values)

End If
Next

End Sub

@zelrick: Thanks for the code that you have provided.

@teze: Hi, How is it going so far? Do you still having trouble loading dgv value to a dgv to other form? Anyway, I have here another sample on how to load dgv to dgv to another form.

@ Form1:

Dim dt As DataTable
    'Handle form load event to initialize dgv
    Private Sub Form1_Load(sender As System.Object, e As System.EventArgs) Handles MyBase.Load
        dt = New DataTable()
        'using 3 columns in a table
        dt.Columns.Add("ColA")
        dt.Columns.Add("ColB")
        dt.Columns.Add("ColC")

        DataGridView1.DataSource = dt

        'loading sample data to a dgv which is consists of 5 rows
        For i As Integer = 1 To 5
            dt.Rows.Add("A" & i, "B" & i, "C" & i)
        Next
    End Sub
    Dim f2 As Form2
    'There have been many options on how to load the dgv to another dgv:
    '1. Load directly the datatable value of dgv1 to dgv2 through its datasource. By handling button1 click event:
    Private Sub Button1_Click(sender As System.Object, e As System.EventArgs) Handles Button1.Click
        f2 = New Form2()
        'calling the function to load datatable directly to a dgv datasource of form2.
        f2.loadDgv1ToDgv2Method1(dt)
        f2.ShowDialog()
    End Sub
    '2. Or this method that uses loop to load the dgv1 datarows to dgv2, which is I think a decent one. So by handling another button click event:
    Private Sub Button2_Click(sender As System.Object, e As System.EventArgs) Handles Button2.Click
        f2 = New Form2()
        'initializing dgv at form2
        f2.initializeDgvAtFrm2()
        'loading dgv datarows to a datatable of dgv2.
        For Each row As DataRow In dt.Rows
            f2.loadDgv1ToDgv2Method2(row("ColA").ToString(), row("ColB").ToString(), row("ColC").ToString())
        Next
        f2.ShowDialog()
    End Sub

Then at Form2:

'1st method:
    Public Sub loadDgv1ToDgv2Method1(dt1 As DataTable)
        DataGridView1.DataSource = dt1
    End Sub

    '2nd method:
    'Initializing dgv Columns, assuming that dgv columns of form1 is the same with form2 dgv columns.
    Dim dt As DataTable
    Public Sub initializeDgvAtFrm2()
        dt = New DataTable()
        'using 3 columns in a table
        dt.Columns.Add("ColA")
        dt.Columns.Add("ColB")
        dt.Columns.Add("ColC")

        DataGridView1.DataSource = dt
    End Sub
    Public Sub loadDgv1ToDgv2Method2(col1 As String, col2 As String, col3 As String)
        dt.Rows.Add(col1, col2, col3)
    End Sub
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