default.aspx.cs

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using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

public partial class _Default : System.Web.UI.Page 
{
    protected void Page_Load(object sender, EventArgs e)
    {
        this.CustomValidator1.ControlToValidate = "TextBox1";//设置要验证控件的ＩＤ
        this.CustomValidator1.ErrorMessage = this.TextBox1.Text + "年不是闰年";//设置错误信息
    }
  
    protected void CustomValidator1_ServerValidate(object source, ServerValidateEventArgs args)
    {
        if (DateTime.IsLeapYear(Convert.ToInt32(args.Value)))//判断输入数字是否为闰年
        {
            args.IsValid = true;//验证通过
        }
        else
        {
            args.IsValid = false;
        }
      
    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        if (Page.IsValid == true)//判断验证是否通过
        {
            Response.Write(TextBox1.Text + "年是闰年");
        }
    }
}