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Net-Framework/ASP_dot_Net-Core/Data-Model/Data-Errors Error CS0815: Cannot assign null to an implicitly-typed variable 19.02.2021 454 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 304 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 617 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/Data-Errors InvalidOperationException: The model item passed into the ViewDataDictionary ..requires System.Collections.Generic.IEnumerable 06.03.2018 20585 InvalidOperationException: The model item passed into the ViewDataDictionary requires System Collections Generic IEnumerable Error message in the browser An unhandled exception occurre