Hi, i have these codes:

Dim dt3 As New DataTable
        dt3.Columns.Add("AdminNo", GetType(String)) '/*Add column AdminNo
        dt3.Columns.Add("PaperNo", GetType(Integer))



    Dim curmodule As String = String.Empty
    For Each dr1 As DataRow In dt1.Rows
        curmodule = dr1("ModuleCode").ToString

        For Each dr2 As DataRow In dt2.Rows
            Dim found As Boolean
            found = False

            For i As Integer = 0 To dt2.Columns.Count - 1

                If curmodule = dr2(i).ToString Then
                    found = True
                    Dim dr3 As DataRow
                    dr3 = dt3.NewRow
                    dr3("AdminNo") = dr1("AdminNo")
                    dr3("PaperNo") = dr2("PaperNo")
                    dt3.Rows.Add(dr3)
                    'DataGridView3.AutoGenerateColumns = True
                    'Me.DataGridView3.DataSource = dt3
                End If
            Next
        Next
    Next

    Dim dt As New DataTable
    '' Create 3 typed columns in the DataTable.
    dt.Columns.Add("ConflictingPaper", GetType(String))
    dt.Columns.Add("Numberofstudents", GetType(Integer))
    dt.Columns.Add("AdminNo", GetType(String))

    'Dim query1 = (From a In dt3 Group Convert.ToString(a.Field(Of Integer)("PaperNo")) By AdminNo = (a.Field(Of String)("AdminNo")) Into Group Select dt.LoadDataRow(New Object() {String.Join(":", Group.ToArray()), Group.Count(), AdminNo}, False)).ToList().Count()

    Dim query = From r In dt3.AsEnumerable() Let adminno = r.Field(Of String)("AdminNo") Group r By adminno Into Group Select New With {.AdminNo = adminno, .numberofstudents = Group.Count(), .conflictingpaper = String.Join(":", Group.Select(Function(r) r.Field(Of Integer)("paperno").ToString()).ToArray())}
    'Dim item As string
    For Each Item In query
        dt.LoadDataRow(New Object() {Item.conflictingpaper, Item.numberofstudents, Item.AdminNo}, True)
    Next
    DataGridView3.DataSource = dt
    DataGridView3.AutoGenerateColumns = True

datatable, dt3 have got data :

paperno     adminno
1           111411H
1          111380Y
2           182739S
3          111380Y
3          111380Y
3           111411H

i want to get the outcome:

 Collapse | Copy Code
conflictingpaper   numberofstudents    adminno
1:3                2                   111411H
blank              blank               111380Y
29:32:3            3                      ...
blank             blank                  ...
blank             blank                   ...

the linq query i did is populating:

1:3             2             127837Y
32:53           5             103928A

numberofstudents column is wrong, it seems to be counting the number of papers conflicted. and is not displaying all the students occurred in the conflicting paper in the format i wanted.

anyone please help me out with the code? Thanks!

I think this statement would be the culprit:

.numberofstudents = Group.Count()

But my LINQ is shoddy at best. :(

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