Textbox client validation and server validation not working

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C#

ASP.NET

Javascript

C#3.5

<script type="text/javascript">
  
  function here()  
  {
     return(confirm("YOU WANT"));  
  }
  
</script>

this is my text box ...

<asp:TextBox ID="TextBox1" Onchange="return here()" runat="server"
       AutoPostBack="True" ontextchanged="TextBox1_TextChanged">

and this is my cs code

protected void TextBox1_TextChanged(object sender, EventArgs e)
    {
        Response.Write("i will peroform data base task");
 
    }

now my problem is ... my javascript function returning true then also my .cs page function is not calling....

What I have tried:

now my problem is ... my javascript function returning true then also my .cs page function is not calling....