login page redirection

<asp:TextBox ID="TextBox1" runat="server">

    <asp:TextBox ID="TextBox2" runat="server">

    <asp:Button ID="Button1" runat="server" Text="Button" OnClick="Button1_Click" />

    <asp:Label ID="Label1" runat="server" Text="Label">

protected void Button1_Click(object sender, EventArgs e)
    {
        int cnt = 0;

        SqlDataAdapter ad1 = new SqlDataAdapter(@"select Id  from UserReg WHERE Name='" + TextBox1.Text + "' AND Password='" + TextBox2.Text + "'", con);
        DataTable dt = new DataTable();
        ad1.Fill(dt);
         cnt = Convert.ToInt32(dt.Rows[0]["Id"]);

         if (cnt > 0)
         {
             Response.Redirect("profile.aspx?id=" + cnt); //Response.Redirect("page.aspx?id=" + cnt);
         }

         else
         {
             Label1.Text = "Invalid username or password";
             this.Label1.ForeColor = Color.Red;
         }
        
       
    }