Nhiềurunat=serverformstrêncùngmộttrang(ASP.NET) ASP.NET không hỗ trợ nhiềurunat=serverformstrêncùngmột trang. Để khắc phục việc này, bạn có thể đặt mỗi form trong mỗi Panel control riêng biệt, và cho phép người dùng dễ dàng chuyển giữa các panel bằng click một radio button. Bạn có thể tham khảo ví dụ sau: 2FormExample.aspx <%@ Page language=''c#'' Codebehind=''2FormExample.cs'' AutoEventWireup=''false'' Inherits=''_3leaf_app.C2FormExample'' %> <html><head> <meta name=vs_targetSchema content=''HTML 4.0''> <meta name=''GENERATOR'' Content=''Microsoft Visual Studio 7.0''> <meta name=''CODE_LANGUAGE'' Content=''C#''></head> <body> <form method=''post'' runat=''server'' ID=Form1> <p>Lookup by <asp:RadioButton id=RadioButton1 runat=''server'' Text=''First Name'' AutoPostBack=''True'' groupname=g1 checked=True></asp:RadioButton> <asp:RadioButton id=RadioButton2 runat=''server'' Text=''Last Name'' AutoPostBack=''True'' groupname=g1></asp:RadioButton></p> <p></p> <p> <asp:Panel id=Panel1 runat=''server'' visible=True> First Name : <asp:TextBox id=TextBox1 runat=''server''></asp:TextBox> <asp:RequiredFieldValidator id=RequiredFieldValidator1 runat=''server'' ErrorMessage=''*'' ControlToValidate=''TextBox1''></asp:RequiredFieldValidator> <asp:Button id=Button1 runat=''server'' Text=''Submit''></asp:Button> </asp:Panel> <asp:Panel id=Panel2 runat=''server'' visible=False> Last Name : <asp:TextBox id=TextBox2 runat=''server''></asp:TextBox> <asp:RequiredFieldValidator id=RequiredFieldValidator2 runat=''server'' ErrorMessage=''*'' ControlToValidate=''TextBox2''></asp:RequiredFieldValidator> <asp:Button id=Button2 runat=''server'' Text=''Submit''></asp:Button> </asp:Panel> <p></p> <p> <asp:label id=Label1 runat=''server''></asp:label> </p> </form> </body></html> 2FormExample.cs namespace _3leaf_app { using System; using System.Collections; using System.ComponentModel; using System.Data; using System.Drawing; using System.Web; using System.Web.SessionState; using System.Web.UI; using System.Web.UI.WebControls; using System.Web.UI.HtmlControls; /// <summary> /// Summary Description for C2FormExample. /// </summary> public class C2FormExample : System.Web.UI.Page { protected System.Web.UI.WebControls.Button Button2; protected System.Web.UI.WebControls.RequiredFieldValidator RequiredFieldValidator2; protected System.Web.UI.WebControls.TextBox TextBox2; protected System.Web.UI.WebControls.Button Button1; protected System.Web.UI.WebControls.RequiredFieldValidator RequiredFieldValidator1; protected System.Web.UI.WebControls.TextBox TextBox1; protected System.Web.UI.WebControls.Label Label1; protected System.Web.UI.WebControls.Panel Panel2; protected System.Web.UI.WebControls.Panel Panel1; protected System.Web.UI.WebControls.RadioButton RadioButton2; protected System.Web.UI.WebControls.RadioButton RadioButton1; public C2FormExample() { Page.Init += new System.EventHandler(Page_Init); } protected void Page_Load(object sender, EventArgs e) { if (!IsPostBack) { } } protected void Page_Init(object sender, EventArgs e) { // // CODEGEN: This call is required by the ASP+ Windows Form Designer. // InitializeComponent(); } /// <summary> /// Required method for Designer support - do not modify /// the contents of this method with the code editor. /// </summary> private void InitializeComponent() { RadioButton1.CheckedChanged += new System.EventHandler (this.RadioButton1_CheckedChanged); Button1.Click += new System.EventHandler (this.Button1_Click); RadioButton2.CheckedChanged += new System.EventHandler (this.RadioButton2_CheckedChanged); Button2.Click += new System.EventHandler (this.Button2_Click); this.Load += new System.EventHandler (this.Page_Load); } public void Button2_Click (object sender, System.EventArgs e) { Label1.Text = ''You want to search on last name''; } public void Button1_Click (object sender, System.EventArgs e) { Label1.Text = ''You want to search on first name''; } public void RadioButton2_CheckedChanged (object sender, System.EventArgs e) { Panel1.Visible = false; Panel2.Visible = true; } public void RadioButton1_CheckedChanged (object sender, System.EventArgs e) { Panel1.Visible = true; Panel2.Visible = false; } } } . Nhiều runat=server forms trên cùng một trang (ASP. NET) ASP.NET không hỗ trợ nhiều runat=server forms trên cùng một trang. Để khắc phục. riêng biệt, và cho phép người dùng dễ dàng chuyển giữa các panel bằng click một radio button. Bạn có thể tham khảo ví dụ sau: 2FormExample.aspx <%@ Page