Question

I Set the controls back ground color in Red when i press the submit button without any data in mandatory fields. But i need to re enter data in these missing mandatory fields. When i start to re enter data, the back ground red color goes white. Is there any chance to change all other mandatory fields color to White?

Private Sub TXTEMPID_KeyPress(ByVal sender As System.Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles TXTEMPID.KeyPress
    UncheckMyControls()
    If Asc(e.KeyChar) <> 8 Then
        If Asc(e.KeyChar) < 48 Or Asc(e.KeyChar) > 57 Then
            e.Handled = True
        End If
    End If
End Sub

Private Sub UncheckMyControls()
    Dim txt, cmb, mtxt, rtxt As Control
    For Each cmb In EMPGBDATA.Controls
        If TypeOf cmb Is ComboBox Then
            If cmb.BackColor = Color.Red Then
                cmb.BackColor = Color.White
            End If
        End If
    Next
    For Each rtxt In EMPGBDATA.Controls
        If TypeOf rtxt Is RichTextBox Then
            If rtxt.BackColor = Color.Red Then
                rtxt.BackColor = Color.White
            End If
        End If
    Next
    For Each mtxt In EMPGBDATA.Controls
        If TypeOf mtxt Is MaskedTextBox Then
            If mtxt.BackColor = Color.Red Then
                mtxt.BackColor = Color.White
            End If
        End If
    Next
    For Each txt In EMPGBDATA.Controls
        If TypeOf txt Is TextBox Then
            If txt.BackColor = Color.Red Then
                txt.BackColor = Color.White
            End If
        End If
    Next
End Sub

This is my Code

Answer 1

As SolarBear suggested:

     For Each cnt In EMPGBDATA.Controls
        If cnt.BackColor = Color.Red Then
            cnt.BackColor = Color.White
        End If
      Next

Now can you describe your problem exactly?

So after your comments:
You said that you are able to check if the mandatory fields are blank and if yes you are setting their backcolor to red. and you popUp as message.
After the message you want in the first time that the user try to type something in any of your textboxes to reset the color to white:

   Private Sub txt_KeyPress(sender As System.Object, e As System.EventArgs) Handles TextBox1.KeyPress,TextBox2.KeyPress,TextBox3.KeyPress,TextBox4.KeyPress
 'After the Handles you put all the textboxes,richtexboxes that you want
 'THis way you handle the same event for a lot of controls in the same Sub
     UncheckMyControls()
   End Sub

So after your comments2:

    Private Sub control_KeyPress(sender As System.Object, e As System.EventArgs) Handles TextBox1.KeyPress,TextBox2.KeyPress,TextBox3.KeyPress,ComboBox1.KeyPress,ComboBox2.KeyPress
 'After the Handles you put all the textboxes,richtexboxes,comboboxes that you want
 'THis way you handle the same event for a lot of controls in the same Sub
     UncheckMyControls()
   End Sub