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Net-Framework/ASP_dot_Net-Core/Data-Model What data type in SQL Server is the same as bigint in C # 06.07.2021 105 Conversion SQL Server to C#: c# long=sql bigint c# int=sql int Net-Framework/ASP_dot_Net-Core/Data-Model/Data-Errors Error CS0815: Cannot assign null to an implicitly-typed variable 19.02.2021 447 Error CS0815: Cannot assign to an implicitly-typed variable When I'm trying to get into C's Asp Net Core Net5 to create a var variable var query= Net-Framework/ASP_dot_Net-Core/Data-Model/Data-Errors Asp.Net Core SQL Server crashed at zero values 19.02.2021 299 Problem: When an Asp Net Core application attaches data from a SQL server, data return often stops The cause is often the data model at sql null values In tables, integer numbers are often defined as zero on SQL Server Net-Framework/ASP_dot_Net-Core/Data-Model/Data-Errors nvalidOperationException: The entity type Model requires a primary key to be defined 18.02.2021 613 An unhandled exception occurred while processing the request InvalidOperationException: The entity type 'myModel' requires a primary key to be defined If you intended to use a keyless entity type , call 'HasNoKey' in OnModelCreating Keyless entity types Sol Net-Framework/ASP_dot_Net-Core/Data-Model SQL Data Types DateTime Date Time und TimeSpan in Asp.Net Excel 21.01.2021 450 SQL Data Types Converting Date Time Datentypes to C , JSON , and Excel SQL Server Datetimeoffset(7) Net-Framework/ASP_dot_Net-Core/Data-Model SQL Server Use Data Type time(7) 21.01.2021 339 SQL Server Use Data Type time(7) How is a SQL Server data type Time(7) represented in the output -> Representation of a SQL server data type time becomes Net-Framework/ASP_dot_Net-Core/Data-Model/Linq Linq: Output to a variable list 16.08.2018 1215 Linq: Output to a variable list How to pass the query results of a Linq query to a free list? Solution: with list and elements of type Object Net-Framework/ASP_dot_Net-Core/Data-Model/Linq Linq: Select Fields in Query 16.08.2018 3006 Linq: Select Fields in Query Error: object does not contain a definition for fieldname Net-Framework/ASP_dot_Net-Core/Data-Model/Linq the type or namespace name dbAppData_Context does not exist 10.08.2018 1215 Problem: Occurs when updating the data model when updating the model at the WPF with an EF Entity Framework connection to a SQL Server database, then it may be that the connection is taken over incorrectly as a data context Net-Framework/ASP_dot_Net-Core/Data-Model/Linq Delete record in Linq 10.08.2018 1207 Delete record in Linq Code snippet: delete record call