Assign Rank to DataTable (DataSet) column using C# and VB.Net in ASP.Net

Hi ryutenkan,

Check this example. Now please take its reference and correct your code.

HTML

<asp:GridView runat="server" ID="GridView1" />

Namespaces

C#

using System.Data;
using System.Linq;

VB.Net

Imports System.Data
Imports System.Linq

Code

C#

protected void Page_Load(object sender, EventArgs e)
{
    if (!this.IsPostBack)
    {
        DataTable dt = new DataTable();
        dt.Columns.Add("Ranking");
        dt.Columns.Add("Name");
        dt.Columns.Add("Points");
        dt.Rows.Add("", "Alpha ", "10");
        dt.Rows.Add("", "Beta", "10");
        dt.Rows.Add("", "Gamma", "8");
        dt.Rows.Add("", "Zeta", "9");

        List<IGrouping<object, DataRow>> result = dt.AsEnumerable().GroupBy(x => x["Points"]).ToList();
        int i = 1;
        int j = 1;
        foreach (IGrouping<object, DataRow> items in result)
        {
            foreach (DataRow dr in items.ToList())
            {
                dt.Select().Where(x => x["Name"] == dr["Name"]).FirstOrDefault()["Ranking"] = i;
                j++;
            }
            i = j;
        }
        GridView1.DataSource = dt;
        GridView1.DataBind();
    }
}

VB.Net

Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
    If Not Me.IsPostBack Then
        Dim dt As DataTable = New DataTable()
        dt.Columns.Add("Ranking")
        dt.Columns.Add("Name")
        dt.Columns.Add("Points")
        dt.Rows.Add("", "Alpha ", "10")
        dt.Rows.Add("", "Beta", "10")
        dt.Rows.Add("", "Gamma", "8")
        dt.Rows.Add("", "Zeta", "9")
        Dim result = dt.AsEnumerable().GroupBy(Function(x) x("Points"))
        Dim i As Integer = 1
        Dim j As Integer = 1
        For Each items As IGrouping(Of Object, DataRow) In result
            For Each dr As DataRow In items.ToList()
                dt.Select().Where(Function(x) x("Name") = dr("Name")).FirstOrDefault()("Ranking") = i
                j += 1
            Next
            i = j
        Next

        GridView1.DataSource = dt
        GridView1.DataBind()
    End If
End Sub

Output