SqlConnection conn = new SqlConnection("Server=.; Database=LoginDatabase; Trusted_Connection=True;");
        conn.Open();
        SqlCommand cmd = new SqlCommand("select * from Userdata where Username=@Username and Password=@Password");
        cmd.Parameters.AddWithValue("@UserName", UserName.Text);
        cmd.Parameters.AddWithValue("@Password", Password.Text);
        SqlDataAdapter da = new SqlDataAdapter(cmd);
        DataTable dtResults = new DataTable();
        da.Fill(dtResults);