Originariamente inviato da cassano
Puoi postare il codice ... in che momento disabiliti la paginazione ???.
Eccolo:

protected void Button1_Click(object sender, EventArgs e)
{

Response.Clear();
Response.ContentType = "application/ms-excel";
Response.AddHeader("content-disposition", "inline;filename=datra.xls");

System.IO.StringWriter stringWrite = new System.IO.StringWriter();
System.Web.UI.HtmlTextWriter htmlWrite = new HtmlTextWriter(stringWrite);
this.GridView1.AllowPaging = false;

this.GridView1.RenderControl(htmlWrite); //htmlWrite scrive


Response.Write(stringWrite.ToString());
Response.End(); }

public override void VerifyRenderingInServerForm (Control control) {

}