datakeys error

[NevilleT]

I have a datagrid and want to identify the primary key. Each time I try I
get an error

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

The code I am using seems straight forward enough.

Private Sub DG_Glossary_SelectedIndexChanged(ByVal sender As System.Object,
ByVal e As System.EventArgs) Handles DG_Glossary.SelectedIndexChanged

Dim IDIndex As Integer
Dim IDKey As Integer
IDIndex = DG_Glossary.SelectedIndex
IDKey = DG_Glossary.DataKeys(IDIndex)
.............
end sub

IDIndex calculates fine but IDKey causes an error.

[Lars-Erik Aabech]

I'm not quite sure, but it might be that IDIndex is -1 if nothing has been
selected yet.
Put an if test that checs if IDIndex is >= 0 before you get the key.

HTH,
Lars-Erik

"NevilleT" <Ne******@discussions.microsoft.com> wrote in message
news:7A**********************************@microsof t.com...

I have a datagrid and want to identify the primary key. Each time I try I
get an error

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

The code I am using seems straight forward enough.

Private Sub DG_Glossary_SelectedIndexChanged(ByVal sender As
System.Object,
ByVal e As System.EventArgs) Handles DG_Glossary.SelectedIndexChanged

Dim IDIndex As Integer
Dim IDKey As Integer
IDIndex = DG_Glossary.SelectedIndex
IDKey = DG_Glossary.DataKeys(IDIndex)
............
end sub

IDIndex calculates fine but IDKey causes an error.

[NevilleT]

Hi Lars
Thanks for the tip but IDIndex is fine. I am using VS2003 and checked by
stepping through the code. There is something else I am missing.
"Lars-Erik Aabech" wrote:

I'm not quite sure, but it might be that IDIndex is -1 if nothing has been
selected yet.
Put an if test that checs if IDIndex is >= 0 before you get the key.

HTH,
Lars-Erik

"NevilleT" <Ne******@discussions.microsoft.com> wrote in message
news:7A**********************************@microsof t.com...

I have a datagrid and want to identify the primary key. Each time I try I
get an error

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

The code I am using seems straight forward enough.

Private Sub DG_Glossary_SelectedIndexChanged(ByVal sender As
System.Object,
ByVal e As System.EventArgs) Handles DG_Glossary.SelectedIndexChanged

Dim IDIndex As Integer
Dim IDKey As Integer
IDIndex = DG_Glossary.SelectedIndex
IDKey = DG_Glossary.DataKeys(IDIndex)
............
end sub

IDIndex calculates fine but IDKey causes an error.