Learn how to debug your code and find out what object has not been instanced. ' at System.Threading._Thread. If a code tries to access an object, and the object has not been instanced, then its Object reference not set to an instance of an object. ' at (ExecutionContext executionContext, ContextCallback callBack, Object state, StackCrawlMark& stackMark) ' at System.Threading._Thread.ThreadStart_Context(Object state) ' at (String assemblyFile, Evidence assemblySecurity, String args) ' at Test_ODP_() in E:\Eigene Dateien\Visual Studio\Projects\\\Module1.vb:line 32 'Message: "Object reference not set to an instance of an object." Instead of having a crazy amount of variable null type checks, you can use the and your code will short circuit and return null instead of throwing the exception. One of the best new additions to C was the null conditional operator. command.ExecuteNonQuery() Use the Null Conditional Operator to Avoid NullReferenceExceptions. Direction = ParameterDirection.ReturnValue //Exception Object reference not set to an instance of an object.
'CREATE OR REPLACE FUNCTION TEST_GET_NUMBER RETURN NUMBER ISĭim command As OracleCommand = connection.CreateCommand() 'Imports 'Microsoft providerĭim connectionString As String = "data source=> user id=> password=> "ĭim connection As New OracleConnection(connectionString)ĭim commandText As String = "TEST_GET_NUMBER"
This error occurs with the Oracle provider only! If you modify the Imports statement in the following test case to use the Microsoft provider, everything works fine! I have a strange error with the following environment: You need to ensure strSearch (or any variable for that matter) is not null before you dereference it using the dot character (.) - i.e.
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