asp.net使用者登入 使用者驗證

方法一：使用IsNullOrWhiteSpace屬性 傳回值為TRUE   加入！取其相反的值

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

public partial class _Default : System.Web.UI.Page

{

    protected void Page_Load(object sender, EventArgs e)

    {

    }

    protected void Button1_Click(object sender, EventArgs e)

        string uname = "admin";

        string upwd = "123456";

        if (!string.IsNullOrWhiteSpace(this.TextBox1.Text) && !string.IsNullOrWhiteSpace(this.TextBox2.Text))

        {

            if (uname == this.TextBox1.Text)

            {

                if (upwd == this.TextBox2.Text)

                {

                    this.TextBox1.Text = this.TextBox2.Text = "";

                    Label1.Text = "登入成功";

                }

                else

                    Label1.Text = "密碼不正确";

            }

            else

                Label1.Text = "使用者名不正确";

        }

        else

            Label1.Text = "使用者名或密碼未輸入";

}

方法二：使用 //--利用RequiredFieldValidator 這個系統自帶的驗證控件進行驗證，需要修改controlvalidate=text1.text 修改errormessage=提示資訊