C#

if (c is TextBox)
{
    TextBox tb = (TextBox)c;
    // do your printing
}

TextBox tb = c as TextBox
if(tb != null)
{
  MessageBox.Show(tb.text);
}

foreach(Control control in Controls)
{
	TextBox textBox = control as TextBox;
	if(textBox != null)
	{
		MessageBox.Show(textBox.Name + ":" + textBox.Text);	
	}
}

DialogResult dialogResult = MessageBox.Show("My Text", "My Title", MessageBoxButtons.OKCancel, MessageBoxIcon.Information);
if(dialogResult == DialogResult.OK)
{
	// Do something if OK
}
else if(dialogResult == DialogResult.Cancel)
{
	// Do something if Cancel
}

Private Sub ValidateUserEntry2()<br />
<br />
<br />
    ' Checks the value of the text.<br />
<br />
    If ServerName.Text.Length = 0 Then<br />
<br />
        ' Initializes variables to pass to the MessageBox.Show method.<br />
<br />
        Dim Message As String = "You did not enter a server name. Cancel this operation?"<br />
        Dim Caption As String = "No Server Name Specified"<br />
        Dim Buttons As Integer = MessageBoxButtons.YesNo<br />
<br />
        Dim Result As DialogResult<br />
<br />
        'Displays a MessageBox using the Question icon and specifying the No button as the default.<br />
<br />
        Result = MessageBox.Show(Me, Message, Caption, MessageBoxButtons.YesNo, _<br />
            MessageBoxIcon.Question, MessageBoxDefaultButton.Button1, MessageBoxOptions.RightAlign)<br />
<br />
<br />
        ' Gets the result of the MessageBox display.<br />
<br />
        If Result = DialogResult.Yes Then<br />
<br />
            ' Closes the parent form.<br />
<br />
            Me.Close()<br />
<br />
        End If<br />
<br />
    End If<br />
<br />
End Sub