Checking if datagridview already exist in another datagridview before inserting using checkbox - vb.net

Question

i have two datagridview and i am trying to insert value in datagridview1 to datagridview2 using checkbox on button click.
For i As Integer = DataGridView1.Rows.Count - 1 To 0 Step -1
Dim c As Boolean
c = DataGridView1.Rows(i).Cells(0).Value
If c = True Then
With DataGridView1.Rows(i)
DataGridView2.Rows.Insert(0, .Cells(0).Value, .Cells(1).Value, .Cells(2).Value, .Cells(3).Value, .Cells(4).Value, .Cells(5).Value)
End With
End If
Next
My code will insert the data everytime i insert it. I want to prevent inserting the same data on datagridview2. As you can see the in the image below everytime i tried to insert the same checkbox i can add it multiple times.
Thank you so much.
This is how i populate my datagridview1.
Sub dgv1_SubjectList()
query = "SELECT subject_id AS '#', subject_name AS 'Descriptive Title', subject_units AS 'Units', sem AS 'Semester', year_level AS 'Year Level' " & _
" FROM subject WHERE course = '" & cmb_Course.Text & "' AND CURRICULUM = '" & curriculum & "' "
da = New MySqlDataAdapter(query, myconn)
da.Fill(ds, "subject")
DataGridView1.DataSource = ds.Tables(0)
DataGridView1.AutoResizeColumns(DataGridViewAutoSizeColumnsMode.AllCells)
End Sub
On datagridview2 i add empty column directly in datagridview2.
Thank you. Sorry for late update.

Answer 1

I tried my best to reproduce your environment.
DataGridView1.AllowUserToAddRows = True
DataGridView2.AllowUserToAddRows = True
DataGridView1.Rows.Insert(DataGridView1.Rows.Count - 1, True, "Row1Col1", "Row1Col2", "Row1Col3", "Row1Col4", "Row1Col5", "Row1Col6")
DataGridView1.Rows.Insert(DataGridView1.Rows.Count - 1, True, "Row2Col1", "Row2Col2", "Row2Col3", "Row2Col4", "Row2Col5", "Row2Col6")
DataGridView2.Rows.Insert(DataGridView2.Rows.Count - 1, False, "Row1Col1", "Row1Col2", "Row1Col3", "Row1Col4", "Row1Col5", "Row1Col6")
For i As Integer = DataGridView1.Rows.Count - 2 To 0 Step -1
If DataGridView1.Rows(i).Cells(0).Value Then
Dim AlreadyInGrid As Boolean = False
Dim ColumnsCount As Integer = DataGridView1.Columns.GetColumnCount(DataGridViewElementStates.Displayed)
For j As Integer = DataGridView1.Rows.Count - 2 To 0 Step -1
For k As Integer = 1 To ColumnsCount - 1
If DataGridView1.Rows(i).Cells(k).Value <> DataGridView2.Rows(j).Cells(k).Value Then Exit For
AlreadyInGrid = (k = ColumnsCount - 1)
Next
If AlreadyInGrid Then Exit For
Next
If Not AlreadyInGrid Then
With DataGridView1.Rows(i)
DataGridView2.Rows.Insert(DataGridView2.Rows.Count - 1, False, .Cells(1).Value, .Cells(2).Value, .Cells(3).Value, .Cells(4).Value, .Cells(5).Value, .Cells(6).Value)
End With
End If
End If
Next

Answer 2

To me it looks like you want to move the row, if that is the case you need not worry about checking if it already exists because it would not be available to try and add it again.
Public Class Form1
Dim ds As New DataSet
Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
'Begin sample setup
ds.Tables.Add(New DataTable With {.TableName = "Table1"})
With ds.Tables(0)
.Columns.Add("Select", GetType(Boolean))
.Columns.Add("ID", GetType(Integer))
.Columns.Add("Column2", GetType(String))
.Rows.Add(False, 1, "test1")
.Rows.Add(False, 2, "test2")
.Rows.Add(False, 3, "test3")
.Rows.Add(False, 4, "test4")
End With
Dim dt As DataTable = ds.Tables(0).Clone
dt.TableName = "Table2"
ds.Tables.Add(dt)
DataGridView1.DataSource = ds.Tables(0)
DataGridView2.DataSource = ds.Tables(1)
'end sample setup
End Sub
Private Sub ButtonAddToDT2_Click(sender As Object, e As EventArgs) Handles ButtonAddToDT2.Click
Validate()
Dim SelRows() As DataRow = ds.Tables(0).Select("Select=True")
For Each DtRow As DataRow In SelRows
ds.Tables(1).ImportRow(DtRow)
ds.Tables(0).Rows.Remove(DtRow)
Next
End Sub
End Class
If it is not your intention to remove the row and you really do want to see if the row exists in datagridview2 let me know and we can make some minor modifications to this code.