Counting duplicates in datagridview and displaying number of duplicates

Question

Hi I am trying to count the number of duplicates in my unbound datagrid.

My problem is that when I clear my string it then starts the count a fresh count and dismisses the previous duplicate entries but if I do not clear the string I get the number of duplicates as the 2nd digit in my string this is fine but I need it do search for duplicates and display the number or duplicates of that sort in the column

I press the button.

Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
        DataGridView2.ColumnCount = 7

        DataGridView2.Columns(0).Name = ""
        DataGridView2.Columns(1).Name = ""
        DataGridView2.Columns(2).Name = ""
        DataGridView2.Columns(3).Name = ""
        DataGridView2.Columns(4).Name = ""
        DataGridView2.Columns(5).Name = ""
        DataGridView2.Columns(6).Name = "UID"

        Dim row As String() = New String() {"", "", "", "", "", "", "" & Label1.Text & "" & Label4.Text & " " & Label3.Text & " " & Label5.Text & " " & Label6.Text & ""}
        DataGridView2.Rows.Add(row)

Timer7.Start()

End Sub

Then This

Private Sub Timer7_Tick(sender As Object, e As EventArgs) Handles Timer7.Tick
  Dim date1 As String = DateTime.Now.ToString("dd MMMM yyyy")
    Form3.DataGridView1.ColumnCount = 7
    Form3.DataGridView1.Columns(0).Name = "SERIAL"
    Form3.DataGridView1.Columns(1).Name = "PORT"
    Form3.DataGridView1.Columns(2).Name = "Attempt"
    Form3.DataGridView1.Columns(3).Name = "PEAK IM3"
    Form3.DataGridView1.Columns(4).Name = "Date of Data"
    Form3.DataGridView1.Columns(5).Name = "Time of Data"
    Form3.DataGridView1.Columns(6).Name = "UID"
    Dim row As String() = New String() {"" & Label1.Text & "", "" & Label4.Text & " " & Label3.Text & " " & Label5.Text & " " & Label6.Text & "", "" & Label15.Text & "", "", date1, CStr(TimeOfDay), "" & Label1.Text & "" & Label4.Text & " " & Label3.Text & " " & Label5.Text & " " & Label6.Text & ""}
    Form3.DataGridView1.Rows.Add(row)

    Dim dc As New Dictionary(Of String, Integer)()
    Dim clV As String

    For i As Integer = 0 To Form3.DataGridView1.Rows.Count - 1

        If Not Form3.DataGridView1.Rows(i).IsNewRow Then

            clV = Me.DataGridView2(6, i).Value.ToString()

            If Not dc.ContainsKey(clV) Then
                dc.Add(clV, +1)
            Else
                dc(clV) += 1
            End If
        End If
    Next

    Dim sb As New StringBuilder()

    For Each kvp As KeyValuePair(Of String, Integer) In dc
        sb.AppendLine(String.Format("{0} ", kvp.Value))
    Next

    Label15.Text = sb.ToString()

    Timer7.Stop()
End Sub

I have spent 2 days trying to figure this out and need some advice on what to do.

Answer 1

Solved:

Had to bind my data to database datatable.

Then I used this to make a filter button in the toolstrip.

Filter column_heading LIKE ? + '%'

Then using the code above it gave the correct count.

Steps were as follows

1. Add data to DGV

2. Save to DGV to Database

3. Filter

4. Count results

5. Refresh DGV