Reorder GridView rows on Checkbox selection in ASP.Net

Hi narasiman,

Please refer below sample.

Database

For this sample I have used of NorthWind database that you can download using the link given below.

Download Northwind Database

HTML

<asp:ScriptManager ID="src1" runat="server">
</asp:ScriptManager>
<asp:UpdatePanel ID="updCustomers" runat="server">
    <ContentTemplate>
        <asp:GridView ID="gvCustomers" runat="server" AutoGenerateColumns="false">
            <Columns>
                <asp:TemplateField>
                    <HeaderTemplate>
                        <asp:CheckBox ID="chk1" runat="server" />
                    </HeaderTemplate>
                    <ItemTemplate>
                        <asp:CheckBox ID="chk2" runat="server" AutoPostBack="true" OnCheckedChanged="gvCustomers_SelectedIndexChanged" />
                    </ItemTemplate>
                </asp:TemplateField>
                <asp:BoundField DataField="CustomerId" HeaderText="CustomerId" />
                <asp:BoundField DataField="Name" HeaderText="Name" />
                <asp:BoundField DataField="Country" HeaderText="Country" />
            </Columns>
        </asp:GridView>
    </ContentTemplate>
</asp:UpdatePanel>

Namespaces

C#

using System.Data;
using System.Data.SqlClient;
using System.Configuration;

Code

C#

protected void Page_Load(object sender, EventArgs e)
{
    if (!this.IsPostBack)
    {
        string constr = ConfigurationManager.ConnectionStrings["constr"].ConnectionString;
        using (SqlConnection con = new SqlConnection(constr))
        {
            using (SqlCommand cmd = new SqlCommand("SELECT  CustomerId, Name, Country FROM Customers", con))
            {
                using (SqlDataAdapter da = new SqlDataAdapter(cmd))
                {
                    DataTable dt = new DataTable();
                    da.Fill(dt);
                    ViewState["dt"] = dt;
                    gvCustomers.DataSource = dt;
                    gvCustomers.DataBind();
                }
            }
        }
    }
}

protected void gvCustomers_SelectedIndexChanged(object sender, EventArgs e)
{
    if (gvCustomers.Rows.Count > 0)
    {
        int index = ((sender as CheckBox).NamingContainer as GridViewRow).RowIndex;
        DataTable dt = ViewState["dt"] as DataTable;
        DataTable dtUpdated = dt.Clone();
        dtUpdated.Rows.Add(dt.Rows[index].ItemArray);
        for (int i = 0; i < dt.Rows.Count; i++)
        {
            if (i != index)
            {
                dtUpdated.Rows.Add(dt.Rows[i].ItemArray);
            }
        }
        ViewState["dt"] = dtUpdated;
        gvCustomers.DataSource = dtUpdated;
        gvCustomers.DataBind();
    }
}

Screenshot