What can cause an EntityCommandExecutionException in EntityCommandDefinition.ExecuteStoreCommands?

Question

A particular LINQ-to-SQL query selecting fields from a SQL Server view in a C# program running against a SQL Server 2008 database, which runs fine in my local dev environmen

Answer 1

This can be caused by "Multiple Active Result Sets" missing in connection String.

Multiple Active Result Sets (MARS) is a feature that allows the execution of multiple batches on a single connection. In previous versions, only one batch could be executed at a time against a single connection. Executing multiple batches with MARS does not imply simultaneous execution of operations.

To Fix:

string connectionString = "Data Source=MSSQL1;" + 
"Initial Catalog=AdventureWorks;Integrated Security=SSPI;" +
"MultipleActiveResultSets=True";