Скачать или смотреть Resolving the Non-invocable member SqlCommand cannot be used like a method Error in C#

Learn how to fix the `Non-invocable member SqlCommand` error in C# when connecting to SQL Server and improve your coding skills.
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This video is based on the question https://stackoverflow.com/q/68504920/ asked by the user 'John Beasley' ( https://stackoverflow.com/u/4262571/ ) and on the answer https://stackoverflow.com/a/68504928/ provided by the user 'Misha Zaslavsky' ( https://stackoverflow.com/u/2667173/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Understanding and Fixing the Non-invocable member SqlCommand cannot be used like a method Error in C#

If you've recently started learning C# and working with SQL Server, you might come across a common compile-time error that states, "Non-invocable member 'SqlCommand' cannot be used like a method." This can be a bit frustrating, especially when you're just beginning your programming journey. Let’s break down the cause of this error and explore how you can resolve it effectively.

The Problem

In your C# code, you're attempting to instantiate an SqlCommand object incorrectly. This method of instantiation is not recognized by the compiler, leading to the error message you're encountering. Here’s specifically where the problem lies in your code:

[[See Video to Reveal this Text or Code Snippet]]

The above line of code is meant to create a new SqlCommand instance. However, it is written incorrectly since SqlCommand is a class and cannot be invoked directly like a method.

The Solution

To correctly instantiate an SqlCommand, you need to use the new keyword followed by the class name and parentheses. This signifies that you are creating a new object. Here's how you can fix it:

Step-by-Step Fix

Change the Instantiation: Modify the line where you create the SqlCommand object. Replace it with the following line:

[[See Video to Reveal this Text or Code Snippet]]

Complete Code Example: Here's how your updated code should look:

[[See Video to Reveal this Text or Code Snippet]]

Key Takeaways

Instantiation of Classes: Always remember to use the new keyword when creating an instance of a class in C# . This lets the compiler know that you are invoking a constructor to allocate memory for the object.

Understanding Errors: Pay close attention to error messages and the lines specified in the code. They often provide hints about what the issue might be.

By making these adjustments to your code, you should be able to compile and run your program without encountering the "Non-invocable member" error. Happy coding!