弹出"保存成功"后转向另外一个网页怎么做？

C# code

protected void btnSave_Click(object sender, EventArgs e){    string script = @"<script language=javascript type=text/javascript>alert('保存成功')</script>"    Response.Redirect("~/Modify.aspx",false);}

这样做直接转向Modify.aspx页面，并没有弹出"保存成功"对话框。
请问如何实现弹出"保存成功"对话框后再转向Modify.aspx页面(这两个操作要在一个事件中完成。)

[解决办法]

C# code

protected void btnSave_Click(object sender, EventArgs e) {    this.ClientScript.RegisterStartupScript(typeof(string),"success","alert('保存成功');window.location.href='Modify.aspx';",true);}
[解决办法]
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C# code
protected void btnSave_Click(object sender, EventArgs e) 
{
    this.ClientScript.RegisterStartupScript(typeof(string),"success","alert('保存成功');window.location.href='Modify.aspx';",true);
}

[解决办法]
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C# code
protected void btnSave_Click(object sender, EventArgs e) 
{
    this.ClientScript.RegisterStartupScript(typeof(string),"success","alert('保存成功');window.location.href='Modify.aspx';",true);
}