gridview控件和分页asp.net

Question

I have a gridview which gets populated in the backend code. I am trying to implement paging now, but when I am trying my way, I am getting nothing. Here is my piece of code:

public void generateTable()
{
    conn.ConnectionString = connString;
    SqlCommand comm = new SqlCommand("ViewBusinessInfo", conn);
    comm.CommandType = CommandType.StoredProcedure;
    comm.CommandTimeout = 2;
    try
    {
        conn.Open();
        SqlDataReader rdr = comm.ExecuteReader();

        if (rdr.HasRows)
        {
            gvAssociation.DataSource = rdr;
            gvAssociation.DataBind();
            gvAssociation.AllowPaging = true;
            gvAssociation.PageSize = 10;
            rdr.Close();
        }
        else
        {
            lblResult.Text = "No businesses found.";
            lblResult.Visible = true;
        }

    }
    catch
    {
    }
    finally
    {
        conn.Close();
    }
}

Can anyone advice what am I doing wrong and I can't get the paging in the gridview? Thx in advance, Laziale

Answer 1

The allowPaging and pagesize property of the gridview can be added in the .aspx, where the gridview tag is present.

<asp:GridView ID="gridView" OnPageIndexChanging="gridView_PageIndexChanging"  AllowPaging="True" pagesize="10" runat="server" />

Additionally, to make the paging links work, you have to add the following code in the gridview_PageIndexChanging event of the gridview:

protected void gridView_PageIndexChanging(object sender, GridViewPageEventArgs e)
{
   gridView.PageIndex = e.NewPageIndex;
   gridView.DataBind();
}

Hope this is helpful.

Answer 2

You cannot use paging with a DataReader. You should fill your data into a Dataset or a Datatable using a DataAdapter. Something like this:

 SqlCommand myCommand = new SqlCommand("ViewBusinessInfo", conn);
 SqlDataAdapter myAdapter = new SqlDataAdapter(myCommand))
 DataTable dt = new DataTable();
 myAdapter.Fill(dt);
 ...

Answer 3

设置AllowPaging和PageSize声明，或对别人打电话之前DataBind()