Handling Sequence has no elements Exception

Question

I am updating a quantity in my cart  but it is throwing a Sequence has no elements  exception   And I don t know what that even means  At first I thought that maybe there was a null value being passed somewhere  but that isn t the case  as I ve checked that      Sequence contains no elements    Description  An unhandled exception   occurred during the execution of the current web request  Please   review the stack trace for more information about the error and where   it originated in the code        Exception Details  System InvalidOperationException  Sequence   contains no elements      Source Error        Line 35                  var uid   WebSecurity CurrentUserId  Line 36    var newqty   Request Form  Quantity    Line 37    OModel Cart c    from item in database Carts Line 38    where item UserId    uid  amp  amp  item PartNumber    pnumber  amp  amp  item OrderId      oid Line 39                                     select item  First      Any ideas what could be causing this

User · Accepted Answer

First   is causing this if your select returns 0 rows  You either have to catch that exception  or use FirstOrDefault   which will return null in case of no elements

User · Answer

Part of the answer to  handle  the  Sequence has no elements  Exception in VB is to test for empty  If Not  myMap Is Nothing  Then   execute code End if   Where MyMap is the sequence queried returning empty null   FYI

User · Answer

I had the same issue  i realized i had deleted the default image that was in the folder just update the  media  missing  on the specific file

User · Answer

You are using linq s First   method  which as per the documentation throws an InvalidOperationException if you are calling it on an empty collection   If you expect the result of your query to be empty sometimes  you likely want to use FirstOrDefault    which will return null if the collection is empty  instead of throwing an exception

User · Answer

The value is null  you have to check why      in addition to the implementation of the solutions proposed here   Check the hardware Connections

User · Answer

Instead of  First   change it to  FirstOrDefault

[c#] Handling 'Sequence has no elements' Exception

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