Error "specified cast is not valid" for datagridview

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I am trying to count distinct value from the dataGrid view, but this error triggers

What I have tried:

int countDiffHallId = dgvEachHallOrGarden.Rows
                           .Cast<DataGridViewRow>()
                           .Select(r => (int)r.Cells["clientId"].Value)
                           .Distinct()
                           .Count();

Posted 20-Sep-21 22:39pm

Member 14921707

Updated 20-Sep-21 22:55pm

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Richard Deeming · Answer 1 · 2021-09-20T22:49:00

Solution 1

The clientId cell in one of your rows does not contain an int value.

We can't tell you which, since we don't have access to your view nor your data.

You will need to debug your code to see what type the values actually are.

Posted 20-Sep-21 22:49pm

Richard Deeming

OriginalGriff · Answer 2 · 2021-09-20T22:55:00

Solution 2

Break it down into separate "chunks" - at a guess at least one of your clientID Cells does not contain a numeric value and it's the (int) cast that is failing.
We can't check that - we have no access to your data!

Posted 20-Sep-21 22:55pm

OriginalGriff