Public Shared Sub EmptyTextBoxes(ByVal parent As Control,ByVal tb As TextBox)
    For Each c As Control In parent.Controls 'LOOP THROUGHN ALL CONTROLS
        If c.GetType() Is GetType(TextBox) Then 'IF ITS A TEXTBOX THEN EMPTY IT
            CType(c, TextBox).Text = String.Empty
            tb.Focus()
        ElseIf c.GetType Is GetType(DropDownList) Then 'ELSE IF ITS A DROPDOWN LIST SET SELECTED VALUE TO -1     
            CType(c, DropDownList).SelectedIndex = 0
        End If
        If c.HasControls Then 'CALL ITSELF (GET ALL OTHER ELEMENTS IN OTHER CONTAINERS)
            EmptyTextBoxes(c)
        End If
    Next
End Sub

ReportTemplate.EmptyTextBoxes(Me, *textbox name*)

public static void EmptyTextBoxes(Control parent, TextBox tb)
{
 foreach (Control c in parent.Controls) {
   if (c.GetType() == typeof(TextBox)) {
     ((TextBox)(c)).Text = string.Empty;
     tb.Focus();
   } else if (c.GetType == typeof(DropDownList)) {
     ((DropDownList)(c)).SelectedIndex = 0;
   }
   if (c.HasControls) {
     EmptyTextBoxes(c, tb);
   }
 }
}