Open MDIPARENT Form on Button Click

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VB

SQL-Server

SQL-Server-2008

, +

Hello All,

I have a login form and after authenticationm when I click on OK, it should open my Main form(which is a MDIParent). I tried in all possible ways but am unable to do that. Can anyone help me with this?

Private Sub OK_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles OK.Click
        Try
            Dim AuthData As New GetData.GetData()
            Dim DT As DataTable = AuthData.GetAuthentication(UsernameTextBox.Text, PasswordTextBox.Text)
            Dim Password As String = DT.Rows(0).Item(0).ToString
            If (Password = PasswordTextBox.Text) Then
                MsgBox("Login Successful")
                Me.Close()
                MainForm.Show()
            Else
                MsgBox("Invalid Password. Please Try Again")
            End If
        Catch EX As Exception
            MsgBox("UserName Not Registered. Please enter a Valid Username and Continue")
        End Try
    End Sub

MainForm is a MDI Container which i am trying to open after successful login.
Please Help Me.