How can i fix this error? c# asp linq

Question

A few minutes ago this part of my code was functional with success, few minutes after i see this when i compile the project

Error image result

And the code is:

    string Cat = ddlCategoria.SelectedValue;
    int? MaxIdCat = (from p in db.tblProducto
                     where p.IdCategoria == Cat
                     select p.IdProducto).Max() + 1;

    txtIdEmp.Text = Convert.ToString(MaxIdCat ?? +1);

please share the table structure and more details.so that we can try to solve. Thanks — karthik krishnasamy
– karthik krishnasamy, Commented Apr 21, 2016 at 2:39

Matt · Accepted Answer · 2016-04-28 12:13:23Z

3

Please make sure Cat is having value in variable and as well as in table. If that value is not existing in table you have to handle is null on the entire linq query.

edited Apr 28, 2016 at 12:13

Matt

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answered Apr 21, 2016 at 2:39

karthik krishnasamy

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