Question

I am using ASP.NET and C#.This is my code.

    private const string ASCENDING = "ASC"; 
    private const string DESCENDING = "DESC";
    public SortDirection GridViewSortDirection 
    {     
        get     
        {         
            if (ViewState["sortDirection"] == null)             
                ViewState["sortDirection"] = SortDirection.Ascending;          
            return (SortDirection) ViewState["sortDirection"];                     
        }     
        set { ViewState["sortDirection"] = value; }  
    }

    public string SortExpression
    {
        get
        {
            if (ViewState["sortExpression"] == null)
                ViewState["sortExpression"] = "JobNumber";
            return ViewState["sortExpression"] as string;
        }
        set { ViewState["sortExpression"] = value; }
    }
    protected void OnSorting(object sender, GridViewSortEventArgs e)
    {
            SortExpression = e.SortExpression;
            if (GridViewSortDirection == SortDirection.Ascending)
            {
                GridViewSortDirection = SortDirection.Descending;
            }
            else
            {
                GridViewSortDirection = SortDirection.Ascending;
            }
            BindGrid();
    }

I am applying sorting for all the columns and working fine. But with date column it is like in this order(dd/mm/yyyy).

• 30/11/2012
• 10/12/2012

• 9/10/2012

  <asp:BoundField DataField="ReportedDate" HeaderText="Reported Date" SortExpression="ReportedDate" DataFormatString="{0:DD/MM/YYYY}" HtmlEncode="false" />
  

the datatype of this column is date.

How to do this?Am i doing wrong?

Answer 1

There are two options

1.To sort at SQL Level,this is the best and proper method,bind the resulting resultset in to gridview.

2.To bind a DataTable with the query output and run a sort on datatable,and then bind it to gridview.
keep in mind to add datatype to datatable column accTable.Columns.Add("Date",typeof(DateTime));