C# Linq to SQL: The type of one of the expressions in the join clause is incorrect. Type inference failed

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I am writing a join query on linq to SQL. I am getting error on join keyword that "Error 14 The type of one of the expressions in the join clause is incorrect. Type inference failed in the call to 'Join'." Could you please help me? Let me know if anything else needed.

C#

var query = (from fd in dbcDefaulter.Fees_Dues
                         join sd in dbcDefaulter.Student_Details on fd.Student_ID equals sd.Student_ID
                         orderby fd.Student_ID
                         select new {  fd.Month }).ToList();

Posted 19-Sep-14 12:06pm

SandeepKushwah

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[no name] 19-Sep-14 18:23pm

Check the types of the expressions in your join.

ZurdoDev 30-Sep-14 10:15am

Your valuable response was the solution. Please post as such.

SandeepKushwah 20-Sep-14 6:18am

Thats perfect. I have done the type cast and issue resolved. Thanks for your valuable response.

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Sudhansu Sekhar Prusty · Answer 1 · 2014-09-30T20:36:00

The types of the properties used in the join condition need to be same in a join query.
Otherwise you can reframe your query like below.

var query = (from fd in dbcDefaulter.Fees_Dues
                         join sd in dbcDefaulter.Student_Details 
on new{
      Student_ID =(int?)fd.Student_ID
      } 
       equals 
             new{
                 Student_ID = (int?)sd.Student_ID
                }
 orderby fd.Student_ID
 select new {  fd.Month }).ToList();