Sharepoint Gridview Filtering, sorting, Paging

Generate a SharePoint gridview  with filtering, sorting , paging.

Define the SPGridview like
---------------------------

<SharePoint:SPGridView ID="gridTaskOrders" runat="server" AutoGenerateColumns="false" EnableModelValidation="true" GridLines="None" OnRowDataBound="gridTaskOrders_RowDataBound" AllowFiltering="true" FilterDataFields="Title,Client" FilteredDataSourcePropertyName="FilterExpression"     AllowSorting="true" DataSourceID="odsGridTaskOrders" FilteredDataSourcePropertyFormat="{1} like    '{0}'" PageSize="10" AllowPaging="true" OnSorting="gridTaskOrders_Sorting" >
        <Columns>
        <asp:TemplateField HeaderText="Task Order Name" HeaderStyle-CssClass="GridHeaderStyleText"           ItemStyle-CssClass="GridItemStyle" SortExpression="Title">
                 <ItemTemplate>
                            <asp:Literal ID="ltrlTaskOrderTitle" runat="server" Text='<%#Eval("Title")%>'>  </asp:Literal>
                 </ItemTemplate>
        </asp:TemplateField>
         <SharePoint:SPBoundField HeaderText="Client" DataField="Client" SortExpression="Client" />
         </Columns>
</SharePoint:SPGridView>

Filtering and sorting are enabled on all the columns.

Define the ObjectDataSource for the SPGridview as below
-------------------------------------------------------


                <asp:ObjectDataSource ID="odsGridTaskOrders" runat="server" SelectMethod="bindGrid"
                    onfiltering="odsGridTaskOrders_Filtering" onobjectcreating="odsGridTaskOrders_ObjectCreating">
               
                </asp:ObjectDataSource>

Here bindGrid() is a method which returns DataTable to bind SPGridview


Define the SPGridviewPager as follows for paging
------------------------------------------------

<SharePoint:SPGridViewPager id="sgvPager" runat="Server" GridViewId="gridTaskOrders"></SharePoint:SPGridViewPager>


For bind data to Grid
---------------------

If we want to bind data to grid then use the below line of code.
          gridTaskOrders.DataBind();
               

Sorting Code
-------------

     private void gridTaskOrders_Sorting(object sender, GridViewSortEventArgs e)
        {
            if (ViewState["FilterExpression"] != null)
            {
                odsGridTaskOrders.FilterExpression = (string)ViewState["FilterExpression"];
            }
        }

        protected sealed override void LoadViewState(object savedState)
        {
            base.LoadViewState(savedState);

            if (Context.Request.Form["__EVENTARGUMENT"] != null &&
                 Context.Request.Form["__EVENTARGUMENT"].EndsWith("__ClearFilter__"))
            {
                // Clear FilterExpression
                ViewState.Remove("FilterExpression");
            }
        }

Filtering code
--------------

        protected void odsGridTaskOrders_Filtering(object sender, ObjectDataSourceFilteringEventArgs e)
        {
            ViewState["FilterExpression"] = ((ObjectDataSourceView)sender).FilterExpression;
        }

Object creating code
----------------------

//Used to deal with the ObjectCreated event

        protected void odsGridTaskOrders_ObjectCreating(object sender, ObjectDataSourceEventArgs e)
        {
            e.ObjectInstance = this;
        }

RowDataBound event
------------------

     protected void gridTaskOrders_RowDataBound(object sender, GridViewRowEventArgs e)
        {
            try
            {
        if (e.Row.RowType == DataControlRowType.Header)
                {
                    if (!string.IsNullOrEmpty(gridTaskOrders.FilterFieldName))
                    {
                        for (int i = 0; i < gridTaskOrders.Columns.Count; i++)
                        {
                            DataControlField field = gridTaskOrders.Columns[i];

                            if (field.SortExpression == gridTaskOrders.FilterFieldName)
                            {
                                Image filterIcon = new Image();
                                filterIcon.ImageUrl = "/_layouts/images/filter.gif";
                                filterIcon.Style[HtmlTextWriterStyle.MarginLeft] = "2px";

                                Literal headerText = new Literal();
                                headerText.Text = field.HeaderText;

                                PlaceHolder panel = new PlaceHolder();
                                panel.Controls.Add(headerText);
                                panel.Controls.Add(filterIcon);

                                e.Row.Cells[i].Controls[0].Controls.Add(panel);

                                break;
                            }
                        }
                    }
                  
                }
        }
    }