SQL/CLR DML Error: Invalid Use Of Side-effecting Or Time-dependent Operator

I am attempting to use a CLR Function to perform an update operation, since a SQL UDF will not allow this within the function. For the POC, I hard-coded the db connection string and setup the assembly to use EXTERNAL_ACCESS. This worked fine and the update operation was running properly via the CLR Function. However, I now want to make the code run in the current db context without plugging in a connection string. So, I've applied "context connection=true" instead of the explicit db string. When I do this, I am receiving the following error:


A .NET Framework error occurred during execution of user defined routine or aggregate
'MyTestCLRUDF':

System.Data.SqlClient.SqlException: Invalid use of side-effecting or time-dependent operator in 'UPDATE' within a function.

System.Data.SqlClient.SqlException:

etc.


I don't understand why simply swapping the connection string would cause this issue. I assume this is somehow related to permissions, and I am missing something. I've tried using each of the three permission levels (external, safe, and unsafe), and no luck.

Any help is appreciated! Here's the code:


public static bool MyTestCLRUDF(Guid myID)

{

string connectionString = "context connection=true";

using (SqlConnection connection = new SqlConnection(connectionString))

{

SqlCommand command = new SqlCommand("MySprocName", connection);

command.CommandType = CommandType.StoredProcedure;

SqlParameter parameter = new SqlParameter("@ID", myID);

command.Parameters.Add(parameter);

connection.Open();

command.ExecuteNonQuery();

connection.Close();

}

return true;

}