namespace error when using namespaces that don't match names

Suppose I create an asp.net website project that loads data into griview from the class library, declaring the library to use loading data for griview

//file: ChitietSP.aspx

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Diagnostics;
// Debug using connectSQL;
// warning
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack) { LoadData(); }
}
string sSQL;
private void LoadData()
{
sSQL = "SELECT * FROM TABKHACHHANG "; sSQL += "ORDER BY MASOPHIEU;";
GridView1.DataSource = ClsConnecSQL.FillDatatable(sSQL);
//warning
}
}

//file: clsConnecSQL.cs

using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
//using connectSQL;
namespace connectSQL
{
public class ClsConnecSQL
{ public static DataTable FillDatatable(string sSQL)
{ //Do somthing...
}
}
}

I have declared the library namespace to be used is still error, asking you to help me

using connectSQL; // warning

GridView1.DataSource = ClsConnecSQL.FillDatatable (sSQL); // error not found connectSQL namespace

4 Replies

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Dong Lam Trien7y ago
If you say that, I think it's not right because in the winForm I declare as above is a good run, but in asp.net webForm, why not understand the namespace, get rid of errors:

The type or namespace name 'connectSQL' could not be found (are you missing a using directive or an assembly reference?)
Jignesh Kumar7y ago
Hi,

Could you please check under reference, your reference of class library is there ?
if not may be you need to add class library reference which has that class.
Jignesh Kumar7y ago
Hi,

Could you please check under reference, your reference of class library is there ?
if not may be you need to add class library reference which has that class.
Salman Beg7y ago
Probably this namespace using connectSQL; not exists in your dll. First include the dll and after that namespace. Thanks