Index was out of range. Must be non-negative and less than the size of the collection. Parameter name: index

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VB.NET

Public Class Form16
    Private Sub CheckBox1_CheckedChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles CheckBox1.CheckedChanged
        Dim check As Boolean
        For i As Integer = 0 To DataGridView3.Rows.Count
            check = DataGridView3.Rows(i).Cells(1).Value
            If check Then
                Exit For
            End If
        Next
        If Not check Then
            MessageBox.Show("You didn't check any checkbox")
        End If
    End Sub
End Class

What I have tried:

Datagridview3 = 2 columns: Name, Work
I tried to change DataGridView3.Rows(i).Cells(1).Value TO DataGridView3.Rows(i).Cells("Work").Value BUT I see another problem.
Can you help me ? Thanks !

Posted 5-Apr-16 0:54am

ionMEMBER

Updated 5-Apr-16 1:01am

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Comments

John C Rayan 5-Apr-16 6:57am

Debug and see this line DataGridView3.Rows(i).Cells(1).Value to see the indexes are valid for all rows.

ionMEMBER 5-Apr-16 7:04am

If I change DefaultValue from 'DBNull' to 0 (false) then problem is:
Conversion from type 'DBNull' to type 'Boolean' is not valid.

1 solution

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Jochen Arndt · Accepted Answer · 2016-04-05T01:01:00

Solution 1

Your loop iterates up to (and including) DataGridView3.Rows.Count. Change it to one less:

VB

For i As Integer = 0 To DataGridView3.Rows.Count - 1

Posted 5-Apr-16 1:01am

Jochen Arndt

Comments

phil.o 5-Apr-16 7:02am

Dammit you beat me :)
I delete my solution which is redundant.