http://msdn.microsoft.com/en-us/libr...pe(VS.80).aspx
private void Form1_Load(object sender, EventArgs e)
{
maskedTextBox1.Mask = "00/00/0000";
maskedTextBox1.ValidatingType = typeof(System.DateTime);
maskedTextBox1.TypeValidationCompleted += new TypeValidationEventHandler(maskedTextBox1_TypeVali dationCompleted);
maskedTextBox1.KeyDown += new KeyEventHandler(maskedTextBox1_KeyDown);
toolTip1.IsBalloon = true;
}
void maskedTextBox1_TypeValidationCompleted(object sender, TypeValidationEventArgs e)
{
if (!e.IsValidInput)
{
toolTip1.ToolTipTitle = "Invalid Date";
toolTip1.Show("The data you supplied must be a valid date in the format mm/dd/yyyy.", maskedTextBox1, maskedTextBox1.Location.X, maskedTextBox1.Location.Y, 5000);
}
else
{
//Now that the type has passed basic type validation, enforce more specific type rules.
DateTime userDate = (DateTime)e.ReturnValue;
if (userDate < DateTime.Now)
{
toolTip1.ToolTipTitle = "Invalid Date";
toolTip1.Show("The date in this field must be greater than today's date.", maskedTextBox1, maskedTextBox1.Location.X, maskedTextBox1.Location.Y, 5000);
e.Cancel = true;
}
}
}
// Hide the tooltip if the user starts typing again before the five-second display limit on the tooltip expires.
void maskedTextBox1_KeyDown(object sender, KeyEventArgs e)
{
toolTip1.Hide(maskedTextBox1);
}