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dictionary contains a null entry for parameter id of non-nullable . . . The parameters dictionary contains a null entry for parameter 'id' of non-nullable type 'System Int32' for method 'DatabaseService_WebAPI Models Product GetProduct (Int32)' in 'DatabaseService_WebAPI Controllers ProductController' An optional parameter must be a reference type, a nullable type, or be declared as an optional parameter
Type SqlConnection is not defined. - social. msdn. microsoft. com Type 'SqlConnection' is not defined I'm sure its something to do with namespaces + inherits My aspx vb page Partial Class _Default Inherits System Web UI Page Protected Sub Page_Load (ByVal sender As Object, _ ByVal e As System EventArgs) If Not Page IsPostBack Then Dim MyConnection As SqlConnection
Security Exception - social. msdn. microsoft. com Description:The application attempted to perform an operation not allowed by the security policy To grant this application the required permission please contact your system administrator or change the application's trust level in the configuration file Exception Details:System Security SecurityException: Request for the permission of type 'System Security Permissions ReflectionPermission
Proper code to dispose of data access objects? There is no reason to dispose of those data objects when the application closes Ending an application will cause the framework to cleanup everything Calling Dispose () is more important when the object is no longer needed, but the application will continue to run But if this form closes without ending the application you might want to call Dispose () on the DataTable and BindingSource Note
Msg 245 Conversion failed when converting the varchar value to data . . . And in a UNION query, the data type for a column is always the one and the same That is, different SELECTs in the UNION has different data types, this needs to be resolved And the way, SQL Server does it is by applying its data-type precedence in which varchar ranks lower than int So 'exactly' is converted to int, and this fails Marked as answer byctrl_ySunday, October 16, 2016 12:02 AM