Hi,
we are having problems with GridView data when using Kentico's WebPart.

I did one webpart for test that has a GridView with sort feature. The code looks like this:

public partial class CMSWebParts_IcapWebParts_CanaisdeInformacao_CronogramaResultados : CMSAbstractWebPart

and for DataBind...

protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
DataTable dt = new DataTable();
dt.Columns.Add("Empresa");
dt.Columns.Add("Referencia");
dt.Columns.Add("DataDivulgacao");
dt.Columns.Add("Horario");
dt.Columns.Add("Teleconferencia");
dt.Columns.Add("Status");

DataRow dr;
dr = dt.NewRow();
dr["Empresa"] = "Petrobrás";
dr["Referencia"] = "2T09";
dr["DataDivulgacao"] = "15/5/09";
dr["Horario"] = "Depois do Pregão";
dr["Teleconferencia"] = "16/12/08 (A definir)";
dr["Status"] = "Previsto";
dt.Rows.Add(dr);

dr = dt.NewRow();
dr["Empresa"] = "Acesita";
dr["Referencia"] = "1T09";
dr["DataDivulgacao"] = "15/2/09";
dr["Horario"] = "Depois do Pregão";
dr["Teleconferencia"] = "16/12/08 (A definir)";
dr["Status"] = "Previsto";
dt.Rows.Add(dr);

dr = dt.NewRow();
dr["Empresa"] = "Bematech";
dr["Referencia"] = "4T08";
dr["DataDivulgacao"] = "15/12/08";
dr["Horario"] = "Depois do Pregão";
dr["Teleconferencia"] = "16/12/08 (A definir)";
dr["Status"] = "Previsto";
dt.Rows.Add(dr);

dr = dt.NewRow();
dr["Empresa"] = "Cosan";
dr["Referencia"] = "3T08";
dr["DataDivulgacao"] = "15/8/08";
dr["Horario"] = "Depois do Pregão";
dr["Teleconferencia"] = "16/12/08 (A definir)";
dr["Status"] = "Previsto";
dt.Rows.Add(dr);

GrdCronograma.DataSource = dt;
GrdCronograma.DataBind();
}
}

and for sorting:

private string ConvertSortDirectionToSql()
{
if (Session["SORT"] != null)
{
switch (Session["SORT"].ToString())
{
case "ASC":
Session["SORT"] = "DESC";
return "DESC";
case "DESC":
Session["SORT"] = "ASC";
return "ASC";
default:
Session["SORT"] = "ASC";
return "ASC";
}
}
Session["SORT"] = "ASC";
return "ASC";
}

protected void GrdCronograma_Sorting(object sender, GridViewSortEventArgs e)
{
DataTable dataTable = GrdCronograma.DataSource as DataTable;

if (dataTable != null)
{
DataView dataView = new DataView(dataTable);
dataView.Sort = e.SortExpression + " " + ConvertSortDirectionToSql();

GrdCronograma.DataSource = dataView;
GrdCronograma.DataBind();
}

GrdCronograma.Columns[0].HeaderStyle.CssClass = "sort";
GrdCronograma.Columns[1].HeaderStyle.CssClass = "sort";
GrdCronograma.Columns[2].HeaderStyle.CssClass = "sort";

switch (e.SortExpression)
{
case "Empresa":
if (Session["SORT"].ToString() == "DESC")
{
GrdCronograma.Columns[0].HeaderStyle.CssClass = "asc";
}
else
{
GrdCronograma.Columns[0].HeaderStyle.CssClass = "desc";
}
break;
case "Referencia":
if (Session["SORT"].ToString() == "DESC")
{
GrdCronograma.Columns[1].HeaderStyle.CssClass = "asc";
}
else
{
GrdCronograma.Columns[1].HeaderStyle.CssClass = "desc";
}
break;
case "DataDivulgacao":
if (Session["SORT"].ToString() == "DESC")
{
GrdCronograma.Columns[2].HeaderStyle.CssClass = "asc";
}
else
{
GrdCronograma.Columns[2].HeaderStyle.CssClass = "desc";
}
break;
}
}

Well, it works outside Kentico, but inside it doesn't... At this line:

DataTable dataTable = GrdCronograma.DataSource as DataTable;

The DataTable returns NULL. It looks like there is no ViewState for the GridView DataSource.

There is any way to "Enable" this ViewState?

Thanks,
Rafael