When i put it in the aspx asp:button OnClientClick="window.location.hash = 'name/city/category'" it's working, but when i tried to put it from codebehind it's not working.

Please advice how should i use window.location.hash from codebehind. I tried:

protected void Button1_Click(object sender, EventArgs e)
        {

ClientScript.RegisterStartupScript(Page.GetType(), "ChangeToHash", "window.location.hash = 'name/city/category';", true);

}

I also tried:

        protected void Page_Load(object sender, EventArgs e)
        {
            if (Request.Form.AllKeys.Contains("Button1"))
            {
//it gets here in button1_click event
ClientScript.RegisterStartupScript(Page.GetType(), "ChangeToHash", "window.location.hash = 'name/city/category';", true);


            

            }
        }

//nothing in Button1_Click event

Also, can i somehow avoid the "#" sign using the window.location.hash?