Implement Sql Server Rank and Denserank Functions in 'Lambda Expressions'

Hi,

The Objective of code is:

In a class there are 100 students, and in talent test they got some marks. I want to rank those students. To implement this,
In Sql Server there are two functions called Rank and Denserank .
Here i implemented those functions in C# using Lambda expressions .

In data base, My table contains Three columns
id,Name,Marks
and i used entity data model.

Here is the code:

#region Rank 

            List<tableToRankStudents> data = dbContext.tableToRankStudentses.ToList();
            int intRank = 0;
            int intNext = 1;
            Func<IGrouping<int?, tableToRankStudents>, int> getRank = (grouping) =>
            {
                int answer = intRank += intNext;
                intNext = grouping.Count();
                return answer;
            };
            var ranked = data
                               .GroupBy(v => v.Marks)
                               .OrderByDescending(v => v.First().Marks)
                               .Select(v => new
                               {
                                   Items = v,
                                   Rank = getRank(v)
                               })
                               .SelectMany(v => v.Items, (s, i) => new
                               {
                                   Name = i.Names,
                                   Marks = i.Marks,
                                   Rank = s.Rank
                               });

            gvRankResult.DataSource = ranked.ToList();
            gvRankResult.DataBind();

            #endregion Rank

            #region Dense Rank 

            int intDenseRank = 0;
            int intDenseNext = 1;
            Func<IGrouping<int?, tableToRankStudents>, int> getDenseRank = (grouping) =>
            {
                int answer = intDenseRank = intDenseNext;
                intDenseNext += 1;
                return answer;
            };
            var DenseRanked = data
                                   .GroupBy(v => v.Marks)
                                   .OrderByDescending(v => v.First().Marks)
                                   .Select(v => new
                                   {
                                       Items = v,
                                       Rank = getDenseRank(v)
                                   })
                                   .SelectMany(v => v.Items, (s, i) => new
                                   {
                                       Name = i.Names,
                                       Marks = i.Marks,
                                       Rank = s.Rank
                                   });

            gvDenseRankResult.DataSource = DenseRanked.ToList();
            gvDenseRankResult.DataBind();

            #endregion Dense Rank

Thank you,
Govind