Value cannot be null. Parameter name: source? [duplicate]

Question

private void cbNomSociete_SelectedIndexChanged(object sender, EventArgs e)
{

  dgvListeAssemblee.DataSource = (
    from x in ListAssemble
    where x.Denomination
           .ToUpper()
           .Contains( cbNomSociete.SelectedItem.ToString().ToUpper() )
    select x
    ).ToList() ;

 }

how can this be fixed please

This looks like a few other stack questions for example: stackoverflow.com/questions/16281133/… OR stackoverflow.com/questions/3244336/… — drew_w
– drew_w, Commented May 7, 2014 at 22:11
Debug it in Visual Studio. Enable the option "Break when exception is thrown" and you'll get the callstack. — Thomas Weller
– Thomas Weller, Commented May 7, 2014 at 22:11

D Stanley · Accepted Answer · 2014-05-07 22:18:48Z

1

how can this be fixed please

Figure out which variable/property is null. Based on the error message, the exception is likely coming from a static Linq extension method (since they all have a first parameter named source), which would mean the most likely candidate is ListAssemble.

If x.Denomination or cbNomSociete.SelectedItem were null you'd see a different error message.

answered May 7, 2014 at 22:18

D Stanley

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