Skip to content

Bits of .NET

Daily micro-tips for C#, SQL, performance, and scalable backend engineering.

  • Asp.Net Core
  • C#
  • SQL
  • JavaScript
  • CSS
  • About
  • ErcanOPAK.com
  • No Access
.NET / Asp.Net Core / C# / Entity Framework

Stop Calling ToList() Too Early – Improve LINQ Performance

- 04.12.25 | 04.12.25 - ErcanOPAK

Calling ToList() too early forces premature execution.

// Bad
var items = db.Users.ToList().Where(...);

// Good
var items = db.Users.Where(...).ToList();

 

Let the database handle filtering and execution.

Related posts:

.NET Core Memory Grows Without Leaks

Observability — Logs Without Correlation IDs Are Noise

What is the purpose of nameof in C#?

Post Views: 6

Post navigation

The One DI Rule You Must Not Break: Avoid Injecting Scoped into Singleton
Build Clean Background Services with IHostedService in .NET
January 2026
M T W T F S S
 1234
567891011
12131415161718
19202122232425
262728293031  
« Dec    

Most Viewed Posts

  • Get the User Name and Domain Name from an Email Address in SQL (923)
  • How to add default value for Entity Framework migrations for DateTime and Bool (811)
  • Get the First and Last Word from a String or Sentence in SQL (808)
  • How to select distinct rows in a datatable in C# (784)
  • How to make theater mode the default for Youtube (659)
  • Add Constraint to SQL Table to ensure email contains @ (561)
  • How to enable, disable and check if Service Broker is enabled on a database in SQL Server (544)
  • Average of all values in a column that are not zero in SQL (510)
  • How to use Map Mode for Vertical Scroll Mode in Visual Studio (455)
  • Find numbers with more than two decimal places in SQL (425)

Recent Posts

  • C# String Operations Hurt Performance
  • C# DateTime Bugs Appear Across Servers
  • C# LINQ Queries Allocate Too Much
  • SQL Deadlocks Appear Sporadically
  • SQL Queries Break After Schema Changes
  • .NET Core Logs Impact Performance
  • ASP.NET Core Startup Becomes Slower
  • Git Branches Linger Forever
  • Git History Becomes Hard to Read
  • Ajax Requests Succeed but Data Is Stale

Most Viewed Posts

  • Get the User Name and Domain Name from an Email Address in SQL (923)
  • How to add default value for Entity Framework migrations for DateTime and Bool (811)
  • Get the First and Last Word from a String or Sentence in SQL (808)
  • How to select distinct rows in a datatable in C# (784)
  • How to make theater mode the default for Youtube (659)

Recent Posts

  • C# String Operations Hurt Performance
  • C# DateTime Bugs Appear Across Servers
  • C# LINQ Queries Allocate Too Much
  • SQL Deadlocks Appear Sporadically
  • SQL Queries Break After Schema Changes

Social

  • ErcanOPAK.com
  • GoodReads
  • LetterBoxD
  • Linkedin
  • The Blog
  • Twitter
© 2026 Bits of .NET | Built with Xblog Plus free WordPress theme by wpthemespace.com