Clear/Cancel/Reset Codes in VB .Net 2013

Example : How to Clear/Cancel/Empty/Default/Reset the different types of VB Controls.

     TextBox1.Text = "Enter a Number"
     TextBox1.Text = "N/A"
     TextBox1.Text = ""
    'TextBox1.Text = String.Empty
    'TextBox1.Text = "00.00"

     Radiobutton1.Checked = False

     Checkbox1.Checked=False

     Combobox1.Text="Select One"
     Combobox1.SelectedIndex = 0
    'Combobox1.Items.Clear()                'clear combo box
               
     DateTimePicker1.Text = Date.Now   'To set the current system date
    'DateTimePicker1.Text = Date.Now.ToShortDateString.ToString
    'DateTimePicker1.Text = Date.Now.ToLongTimeString
    'DateTimePicker1.Text = Date.Now.ToLongTimeString.ToString
    'DateTimePicker1.Text = ""                  

     DataGridView1.DataSource = Nothing    'To clear the contents of DataGridView1
    'DataGridView1.Rows.Clear()            'clear datagridview               
     
     ClosePreviewWindow()   'For closing the preview window,if any

     Picturebox1.Image = Nothing          'To Clear the image

 -----------  OR  ------------

'Code to Clear specific VB controls on pressing escape button

  Private Sub Textbox2_KeyDown(sender As Object, e As KeyEventArgs) Handles 
    TxtVechNo.KeyDown
       If e.KeyCode = Keys.Escape Then
            Textbox1.Text= ""
       End if     
  End Sub

 -----------  OR  ------------

 Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
    If TextBox1.TextLength <= 0 Then
       MsgBox("Enter Text in this Box")
       TextBox1.Focus()
       Exit Sub
    End If
 End Sub