Showing error :index was out of range. In datagridview please help....

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hello
sir
getting error when run the loop and going to last value of row count
please help

and i can not use the 2nd loop in the place of cells(?????) number how can i use this

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

What I have tried:

Dim aa As Integer
       For Z1 = 0 To DataGridView1.RowCount

           If Me.DataGridView1.Rows(Z1).Cells(2).Value = True Then
               aa = 1
           Else
               aa = 0
           End If
           Me.DataGridView1.Rows(Z1).Cells(7).Value = aa
           If Me.DataGridView1.Rows(Z1).Cells(3).Value = True Then
               aa = aa & 1
           Else
               aa = aa & 0
           End If
           Me.DataGridView1.Rows(Z1).Cells(7).Value = aa
           If Me.DataGridView1.Rows(Z1).Cells(4).Value = True Then
               aa = aa & 1
           Else
               aa = aa & 0
           End If
           Me.DataGridView1.Rows(Z1).Cells(7).Value = aa
           If Me.DataGridView1.Rows(Z1).Cells(5).Value = True Then
               aa = aa & 1
           Else
               aa = aa & 0
           End If
           Me.DataGridView1.Rows(Z1).Cells(7).Value = aa
           If Me.DataGridView1.Rows(Z1).Cells(6).Value = True Then
               aa = aa & 1
           Else
               aa = aa & 0
           End If
           Me.DataGridView1.Rows(Z1).Cells(7).Value = aa
       Next

Posted 31-Jan-19 16:41pm

Jayanta Modak

Updated 31-Jan-19 19:47pm

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OriginalGriff · Accepted Answer · 2019-01-31T19:47:00

The VB For loop runs from the start to the end value inclusive - so this:

For index As Integer = 0 To 3
    Console.Write(index.ToString & " ")
Next

Will print

0 1 2 3

So your code

For Z1 = 0 To DataGridView1.RowCount

will work from the first index to the one after the last index inclusive, and your app throws an exception. Try:

For Z1 = 0 To DataGridView1.RowCount - 1