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);
}

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);
}

------解决方案--------------------
探讨

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);
}


------解决方案--------------------
探讨

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);
}