DataGridView Remove Error - vb.net

Question

I want to delete the duplicate value and blank lines in the DataGridView.
I am using the following code for this.
Private Sub dgwsil()
On Error Resume Next
For i2 As Integer = DataGridView1.RowCount - 1 To 0 Step -1
If Trim(DataGridView1.Rows(i2).Cells(0).Value.ToString()) = "" Then
DataGridView1.Rows.RemoveAt(i2)
End If
Next
Dim numberOfRows = DataGridView1.Rows.Count
Dim i As Integer = 0
While i < numberOfRows - 2
For ii As Integer = (numberOfRows - 1) To (i + 1) Step -1
If DataGridView1.Rows(i).Cells(0).Value.ToString() = DataGridView1.Rows(ii).Cells(0).Value.ToString() Then
DataGridView1.Rows.Remove(DataGridView1.Rows(ii))
numberOfRows -= 1
End If
Next
i += 1
End While
End Sub
Code sometimes works fine.
But sometimes it gives an error
How can I solve this problem ? Or is there any code you use for it?

Answer 1

It looks like you are going into this problem with a VBA mindset. In VBA, you would usually manipulate the datagridview directly and the On Error Resume Next line would be acceptable.
In VB.NET you don't want to do either of those things. Your datagridview should be bound to a collection of information. That collection can be a datatable or an array or any type of collection really. So instead of using a loop to manipulate the datagridview directly you would either loop through the backing collection or better yet LINQ through the collection and manipulate it however you need. There are a ton of tutorials out there explaining everything you could ever need so googling around for how to bind a datatable to a datagridview should get you what you need.
I would also suggest looking into the Try...Catch...Finally... structure. You should really use that to handle any errors that could possibly come up from your code.