在一般情况下。Response.Redirect 该方法是在server年底转向，因此，除非 Response.Write("<script>window.location='http://dotnet.aspx.cc';</script>") 方法外，是不能在新窗体打开所指定的 URL 地址的。可是，假设细致分析一下。假设设置 form 元素的 target 属性，还是有办法打开新窗体的。以下就是能够採用的两种方法。
方法一：在server端设置 target 属性，这种方法也很适用于client不支持脚本的情况。
代码例如以下：
<%@ Page Language="C#" AutoEventWireup="true" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
protected void Page_Load(object sender, EventArgs e)
{
form1.Target = "_blank";
}
protected void Button1_Click(object sender, EventArgs e)
{
Response.Redirect("http://dotnet.aspx.cc");
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
<title></title>
</head>
<body id="b" runat="server">
<form id="form1" runat="server">
<asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="打开新窗体或者新 Tab " />
</form>
</body>
</html>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
protected void Page_Load(object sender, EventArgs e)
{
form1.Target = "_blank";
}
protected void Button1_Click(object sender, EventArgs e)
{
Response.Redirect("http://dotnet.aspx.cc");
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
<title></title>
</head>
<body id="b" runat="server">
<form id="form1" runat="server">
<asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="打开新窗体或者新 Tab " />
</form>
</body>
</html>
办法二：採用client脚本的方法设置 target 属性。代码例如以下：
<%@ Page Language="C#" AutoEventWireup="true" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
protected void Page_Load(object sender, EventArgs e)
{
Button1.Attributes.Add("onclick", "this.form.target='_newName'");
}
protected void Button1_Click(object sender, EventArgs e)
{
Response.Redirect("http://dotnet.aspx.cc");
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
<title></title>
</head>
<body id="b" runat="server">
<form id="form1" runat="server">
<asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="打开新窗体或者新 Tab " />
</form>
</body>
</html>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
protected void Page_Load(object sender, EventArgs e)
{
Button1.Attributes.Add("onclick", "this.form.target='_newName'");
}
protected void Button1_Click(object sender, EventArgs e)
{
Response.Redirect("http://dotnet.aspx.cc");
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
<title></title>
</head>
<body id="b" runat="server">
<form id="form1" runat="server">
<asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="打开新窗体或者新 Tab " />
</form>
</body>
</html>
上面两种方法中的 target 属性能够採用不论什么合法的名称。但要注意，假设同样名称的窗体已经打开，则新窗体会在已经存在名称的窗体里打开。
更新：假设须要设置弹出窗体的宽度和高度，能够改动为以下的方法：
<%@ Page Language="C#" AutoEventWireup="true" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
protected void Page_Load(object sender, EventArgs e)
{
string WindowName = "win" + System.DateTime.Now.Ticks.ToString();
Page.RegisterOnSubmitStatement("js", "window.open('','" + WindowName + "','width=600,height=200')");
form1.Target = WindowName;
}
protected void Button1_Click(object sender, EventArgs e)
{
Response.Redirect("http://dotnet.aspx.cc");
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
<title></title>
</head>
<body id="b" runat="server">
<form id="form1" runat="server">
<asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="打开新窗体或者新 Tab " />
</form>
</body>
</html>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
protected void Page_Load(object sender, EventArgs e)
{
string WindowName = "win" + System.DateTime.Now.Ticks.ToString();
Page.RegisterOnSubmitStatement("js", "window.open('','" + WindowName + "','width=600,height=200')");
form1.Target = WindowName;
}
protected void Button1_Click(object sender, EventArgs e)
{
Response.Redirect("http://dotnet.aspx.cc");
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
<title></title>
</head>
<body id="b" runat="server">
<form id="form1" runat="server">
<asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="打开新窗体或者新 Tab " />
</form>
</body>
</html>
第二种弹出的方法能够參见老外的文章：
http://weblogs.asp.net/infinitiesloop/archive/2007/09/25/response-redirect-into-a-new-window-with-extension-methods.aspx