Using SqlDataAdapter to page a SqlDataReader source

Question

This question seems to be common and I went through this answer already.

Unfortunately, my page still isn't being paged. Here's what my code looks like in C#:

 SqlCommand command = new SqlCommand("(SELECT ......", Connection);
 SqlDataAdapter myAdapter = new SqlDataAdapter(command);
 DataTable dt = new DataTable();
 myAdapter.Fill(dt);

 command.Connection = connection;
 command.Connection.Open();

 GridView1.DataSource = dt;
 GridView1.DataBind();
 GridView1.AllowPaging = true;
 GridView1.PageSize = 15;

 command.Connection.Close();
 command.Connection.Dispose();

Unfortunately, when I do this, my paging doesn't show up. Am I doing something wrong?

Thanks

Answer 1

Set all of the Paging-related properties before the Databind() method is called. When you use Custom Paging you will have to handle the GridView1_PageIndexChanging event. You need to change the current PageIndex, and re-bind your GridView like this:

void bindGridview()
{
    SqlCommand command = new SqlCommand("(SELECT ......", Connection);
    SqlDataAdapter myAdapter = new SqlDataAdapter(command);
    DataTable dt = new DataTable();
    myAdapter.Fill(dt);

    command.Connection = connection;
    command.Connection.Open();
    GridView1.AllowPaging = true;
    GridView1.PageSize = 15;
    GridView1.DataSource = dt;
    GridView1.DataBind();


    command.Connection.Close();
    command.Connection.Dispose();
}

protected void GridView1_PageIndexChanging(object sender, GridViewPageEventArgs e)
{
    GridView1.PageIndex = e.NewPageIndex;
    bindGridview();
}

If you are also binding the GridView on Page_Load, do it like this:

protected void Page_Load(object sender, EventArgs e)
{
    if(!IsPostBack)
        bindGridview();
}

Answer 2

You need to add the PageIndexChanging event of GridView to enable paging.

protected void GridView1_PageIndexChanging(object sender, GridViewPageEventArgs e)
{
    GridView1.PageIndex = e.NewPageIndex;
    bindGridview(); 
}