如何使用错误提醒控件.zip

如何使用错误提醒控件,初学者demo winform程序,。net2.0以上版本支持! private System.Windows.Forms.GroupBox groupBox1; private System.Windows.Forms.Label label1; private System.Windows.Forms.TextBox textBox1; private System.Windows.Forms.TextBox textBox2; private System.Windows.Forms.Label label2; private Sys