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Net-Framework/ASP_dot_Net-Core/Data-Model/Linq Linq Query Linq Query: Create multiple AND and OR in one query 07.10.2021 468 This C# code shows how to merge a SQL Server table with LINQ according to multiple AND conditions and multiple OR conditions Example Linq EF Code C# Code EF Entity Framework, API Controller in asp net co Net-Framework/ASP_dot_Net-Core/Data-Model/Linq LINQ: Creating Multiple OR Subqueries in a WHERE Condition 07.10.2021 229 The following LINQ statement filters data in a Linq query with sub-sets The filter is referred to subqueries with ANY(value in Subdata) Technically, this solution also corresponds to a ForEach query, in which an OR filter is set up in the WHERE (Filter=A OR Fil Net-Framework/ASP_dot_Net-Core/Data-Model/Linq LINQ: ForEach Loop in Linq Query to create WHERE or subqueries 07.10.2021 275 Code example for creating multiple WHERE conditions in a LINQ query Here it is shown how to integrate a multiple AND link into a LINQ SQL text this prevents many individual queries from being sent to the sql server but only a single sql query that combines the whe Net-Framework/ASP_dot_Net-Core/Data-Model/Linq Connect existing database to ASP Core project 05.10.2021 572 How do you connect an existing database to a new ASP Core MVC project? in Visual Studio Step 1: Connect the Database Server in Visual Studio Net-Framework/ASP_dot_Net-Core/Data-Model What data type in SQL Server is the same as bigint in C # 06.07.2021 289 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 671 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 448 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 756 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 736 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 467 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