8.11.txt

来自「《Microsoft Visual C# .NET 2003开发技巧大全》源代码」· 文本 代码 · 共 21 行

Listing 8.11 Validating Form Input
private void tbLastName_Validating(object sender,
System.ComponentModel.CancelEventArgs e)
{
if( tbLastName.Text == “” )
{
// setting e.Cancel to true requires user to
// fill in field before continuing
e.Cancel = true;
errorProvider1.SetError( tbLastName, “Please enter a last name” );
}
}
private void tbFirstName_Validating(object sender,
System.ComponentModel.CancelEventArgs e)
{
if( tbFirstName.Text == “” )
{
// set error field but allow user to set focus to other controls
errorProvider1.SetError( tbFirstName, “Please enter a first name” );
}
}