Open Page in New Tab using Response.Redirect in ASP.Net

hi 

I have 1 textbox and 1 button in my page

when users type their user name in text box they go to their page 

these are my code

   <div id="behcode">
           <div id="divbehcodebtn">
            <asp:ImageButton ID="ImageButton3" runat="server" CssClass="imgbtnbehcode" 
                   onclick="ImageButton3_Click" OnClientClick = "return ValidateRange()" ForeColor="Transparent" AlternateText="" />
        </div>
         
        <div id="TBright">
        <asp:TextBox ID="txtNumeric" runat="server" onkeydown = "return isNumeric(event.keyCode);" onpaste = "return false;" CssClass="txtbehcode"></asp:TextBox>
  
        </div>
         
         </div>

Behind code

  protected void ImageButton3_Click(object sender, ImageClickEventArgs e)
    {

        string data = Server.UrlEncode(txtNumeric.Text);

        SqlCommand _cmd = new SqlCommand("traidname", _cn);
        _cmd.CommandType = CommandType.StoredProcedure;

        _cmd.Parameters.Add("@BehCode", data);

        _cn.Open();
        string tName = _cmd.ExecuteScalar().ToString();

        _cn.Close();
        Response.Redirect(tName + "?BehCode=" + Server.UrlEncode(txtNumeric.Text));
     

    }

how i can do it?

Thanks