Gridview Sorting With Asc Desc image in ASP.Net

Refer the below link.

https://blogs.msdn.microsoft.com/scothu/2010/08/28/gridview-with-sort-arrows-and-showing-header-when-empty/

Hi tyt2314,

I have created sample that fullfill your requirement.

HTML

<div>
    <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" AllowSorting="True" OnSorting="GridView1_Sorting">
        <Columns>
            <asp:TemplateField HeaderText="Id" SortExpression="Id">
                <ItemTemplate>
                    <asp:Label ID="lblId" runat="server" Text='<%# Bind("Id") %>'></asp:Label>
                </ItemTemplate>
            </asp:TemplateField>
            <asp:BoundField DataField="Name" HeaderText="Name" SortExpression="Name" />
            <asp:BoundField DataField="Country" HeaderText="Country" SortExpression="Country" />
        </Columns>
    </asp:GridView>
</div>

Code

protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        DataTable dt = new DataTable();
        dt.Columns.AddRange(new DataColumn[3] { new DataColumn("Id"), new DataColumn("Name"), new DataColumn("Country") });
        dt.Rows.Add(1, "John Hammond", "United States");
        dt.Rows.Add(2, "Mudassar Khan", "India");
        dt.Rows.Add(3, "Suzanne Mathews", "France");
        dt.Rows.Add(4, "Robert Schidner", "Russia");
        GridView1.DataSource = dt;
        GridView1.DataBind();
        ViewState["tables"] = dt;
    }
}
protected void GridView1_Sorting(object sender, GridViewSortEventArgs e)
{
    string SortDir = string.Empty;
    DataTable dt = new DataTable();
    dt = ViewState["tables"] as DataTable;
    {
        if (dir == SortDirection.Ascending)
        {
            dir = SortDirection.Descending;
            SortDir = "Desc";
        }
        else
        {
            dir = SortDirection.Ascending;
            SortDir = "Asc";
        }
        DataView sortedView = new DataView(dt);
        sortedView.Sort = e.SortExpression + " " + SortDir;
        GridView1.DataSource = sortedView;
        GridView1.DataBind();
        for (int i = 0; i < GridView1.Columns.Count; i++)
        {
            string lbText = ((LinkButton)GridView1.HeaderRow.Cells[i].Controls[0]).Text;
            if (lbText == e.SortExpression)
            {
                TableCell tableCell = GridView1.HeaderRow.Cells[i];
                Image img = new Image();
                img.ImageUrl = (SortDir == "Asc") ? "~/Images/asc.gif" : "~/Images/desc.gif";
                tableCell.Controls.Add(img);
            }
        }
    }
}
public SortDirection dir
{
    get
    {
        if (ViewState["dirState"] == null)
        {
            ViewState["dirState"] = SortDirection.Ascending;
        }
        return (SortDirection)ViewState["dirState"];
    }
    set
    {
        ViewState["dirState"] = value;
    }
}

Screenshot