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Hi ,

I am using Visual Studio 2013 ultimate, i have dataset and it contains values.when i try to get the RegID column value alone i get the below error .RegID column does not have null value
"Unable to cast object of type 'System.Data.EnumerableRowCollection`1[System.Data.DataRow]' to type 'System.Data.EnumerableRowCollection`1[System.Data.DataRow]'."

My code is

string StrRegID = string.Join(";", (from DataRow objRow in objSet.Tables[0].AsEnumerable() select objRow.Field<long>("RegID").ToString()).ToArray());
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Comments
ZurdoDev 2-Jul-14 9:59am    
Looks like you're trying to do too much in one line. Break it out so that it makes more sense and then you'll see where the error is.
member33 2-Jul-14 16:54pm    
try this

tring.Join(";", (from DataRow objRow in objSet.Tables[0].AsEnumerable() select objRow.Field("RegID").ToString()).ToList().ToArray());
Matt T Heffron 2-Jul-14 19:34pm    
Adding the .ToList() before the .ToArray() is nonsense.
Both take an IEnumerable<T> and build the corresponding collection.

1 solution

Why do you have the .AsEnumerable()?
From docs:
The AsEnumerable<TSource>(IEnumerable<TSource>) method has no effect other than to change the compile-time type of source from a type that implements IEnumerable<T> to IEnumerable<T> itself. 
 
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