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 |  
//je fais persister le sortdirection dans le viewstate
  protected SortDirection CurrentDirection
    {
        get
        {
            if (this.ViewState["CurrentDirection"] != null)
            {
                return (SortDirection)this.ViewState["CurrentDirection"];
            }
            return SortDirection.Ascending;
        }
        set { this.ViewState["CurrentDirection"] = value; }
    }
 
    protected void gvJob_PageIndexChanging(object sender, GridViewPageEventArgs e)
    {
 
         //ici je ne sais pas quoi faire pour garder le sortdirection a DESC il repasse automatiquement a ASC
 
        gvJob.PageIndex = e.NewPageIndex;
        gvJob.DataBind();
    }
 
    protected void gvJob_Sorting(object sender, GridViewSortEventArgs e)
    {
 
        this.CurrentDirection = CurrentDirection == SortDirection.Ascending ? SortDirection.Descending : SortDirection.Ascending;
 
 
        DataTable dataTable = gvJob.DataSource as DataTable;
 
        if (dataTable != null)
        {
            DataView dataView = new DataView(dataTable);
            dataView.Sort = e.SortExpression + " " + ConvertSortDirectionToSql(CurrentDirection);
 
            gvJob.DataSource = dataView;
 
            gvJob.DataBind();
        }
    }
 
    private string ConvertSortDirectionToSql(SortDirection sortDirection)
    {
        string newSortDirection = String.Empty;
 
        switch (sortDirection)
        {
            case SortDirection.Ascending:
                newSortDirection = "ASC";
                break;
 
            case SortDirection.Descending:
                newSortDirection = "DESC";
                break;
        }
 
        return newSortDirection;
    } | 
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