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How to Update appsettings.json in C#
By Tan Lee Published on Mar 06, 2025 431
To update values programmatically within a settings JSON file, you will need to overwrite the entire settings.json file.
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Injecting ILogger into Dapper Polly Retry Policy in C#
By Tan Lee Published on Mar 11, 2025 234
To inject ILogger into a Dapper Polly Retry Policy in C#, you can follow these steps.
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Properly Disposing HttpContent When Using HttpClient in C#
By Tan Lee Published on Mar 11, 2025 180
In versions prior to .NET Core 3.0 (including .NET Framework), database connection pooling was automatically managed by the framework, with the connection object being disposed of at the end of each operation.
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How to send a file with HttpClient in C#
By Tan Lee Published on Mar 11, 2025 345
When uploading a file with HttpClient, you need to place the file inside a MultipartFormDataContent object, which will be sent as the body of the HTTP request.
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How to Deserialize JSON with quoted numbers in C#
By Tan Lee Published on Mar 11, 2025 238
In JSON, numbers can be represented in two main formats: as literal numbers (e.g., 123) or as quoted strings (e.g., "123").
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How to Configure HttpClient connection keep-alive in C#
By Tan Lee Published on Mar 11, 2025 395
When using a single instance of SqlConnection to interact with a database, the connection is pooled, meaning it can be reused for subsequent requests to improve performance.
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How to add request headers when using HttpClient in C#
By Tan Lee Published on Mar 11, 2025 339
When using HttpClient to send requests in C#, there are two primary ways to add headers:
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How to Delete records with Dapper in C#
By Tan Lee Published on Mar 10, 2025 229
In C#, you can use Dapper to delete records from a database by executing a DELETE statement with the Execute() method, passing in the record identifier as a parameter.
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How to Execute a SELECT query with Dapper in C#
By Tan Lee Published on Mar 10, 2025 281
You can query a database in C# using Dapper by executing a SELECT query with the Query() method, specifying the type to map the results to, and optionally adding parameters.
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How to Get inserted identity value with Dapper in C#
By Tan Lee Published on Mar 10, 2025 320
When inserting a record into a table that has an identity column, the database automatically generates a value for that column. To retrieve the identity value after the insert, you can use the OUTPUT INSERTED.
How to Create overlay modal popup in C#
By Tan Lee Published on Jul 16, 2024 9.08K
Creating an overlay modal dialog in a C# Windows Forms Application involves several steps.
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Hide URL in Popup Window with window.open
By Tan Lee Published on Feb 08, 2025 399
If you're using the window.open() method to open a popup on your website, the URL of the opened window often appears in the address bar.
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How to Center a Popup Window on Screen
By Tan Lee Published on Feb 08, 2025 179
You can use JavaScript's window.open() method to create and center a popup window. By setting the correct values for left and top, we can position the window in the middle of the screen.
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How to undo the changes in Entity Framework
By Tan Lee Published on May 28, 2024 1.32K
Implementing an undo/redo feature for a DbContext in Entity Framework (EF) is a challenging task because Entity Framework does not provide built-in support for undo/redo operations.
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How to fix 'IMvcBuilder' does not contain a definition for 'AddNewtonsoftJson'
By Tan Lee Published on Jun 21, 2024 3.96K
The error message you are seeing, "IMvcBuilder does not contain a definition for AddNewtonsoftJson", typically occurs when you're trying to add Newtonsoft.Json support to an ASP.NET Core MVC application, but the necessary package or using directive is missing.
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How to setup a webapi controller for multipart/form-data
By Tan Lee Published on Feb 16, 2024 812
If you uploaded file through webapi in angularjs and encountered the following error: ExceptionMessage=No MediaTypeFormatter is available to read an object of type ‘HttpPostedFileBase’ from content with media type 'multipart/form-data'.
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How to get unix timestamp in C#
By Tan Lee Published on Jul 11, 2024 2.23K
In C#, you can get the Unix timestamp, which represents the number of seconds that have elapsed since January 1, 1970 (Unix epoch), in a couple of ways.
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How to fix 'Cross-thread operation not valid: Control accessed from a thread other than the thread it was created on'
By Tan Lee Published on Jul 08, 2024 1.74K
The error "Cross-thread operation not valid: Control accessed from a thread other than the thread it was created on" typically occurs in multi-threaded applications when you try to update or interact with UI controls from a thread other than the one that created those controls.
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EF Core - Aggregate SELECT queries
By Tan Lee Published on Feb 06, 2025 124
In this article, I’ll demonstrate how to use EF Core to aggregate data from a table, group it by a specific category, and apply conditions to include only certain groups.
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Tuples in C#
By Tan Lee Published on Feb 06, 2025 179
This guide introduces Tuples in C#, offering an exploration of their key features and uses. It aims to provide a thorough understanding of Tuples, highlighting their significance as a versatile and powerful data structure in C#.
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How to send a file using HttpClient in C#
By Tan Lee Published on Jan 22, 2025 444
When working with HTTP requests in C#, one common task is sending files through a POST request.
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Sending query strings using HttpClient in C#
By Tan Lee Published on Jan 21, 2025 481
Query strings consist of a ? followed by one or more key-value pairs separated by &. It is essential to ensure that special characters, such as spaces or Unicode characters, are properly encoded.
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The referenced component could not be found
By Tan Lee Published on Jan 21, 2025 353
When opening a C# project in Visual Studio, you may encounter a frustrating error where none of the references load correctly.
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Fixing the Sync over Async Antipattern in C#
By Tan Lee Published on Jan 21, 2025 236
One common mistake developers make is the Sync over Async antipattern, which occurs when blocking waits are used in asynchronous methods instead of awaiting them properly.
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C# Remove items from dictionary
By Tan Lee Published on Jan 21, 2025 313
Dictionaries store key/value pairs. To remove one or more items from a dictionary, you can use the following methods:
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Adding dynamic parameters with Dapper in C#
By Tan Lee Published on Jan 18, 2025 442
When executing queries using Dapper, passing dynamic parameters can be done easily with a Dictionary
C# EventHandler
By Tan Lee Published on Jan 18, 2025 259
Events are a core implementation of the observer pattern and consist of two main components:
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How to fix 'InvalidOperationException: Scheme already exists: Bearer'
By Tan Lee Published on Jan 17, 2025 715
The System.InvalidOperationException: Scheme already exists: bearer error typically occurs when you're working with authentication in a .NET application, and you've registered the Bearer authentication scheme multiple times, which causes a conflict.
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How To Auto Ellipse Text in C#
By Tan Lee Published on Jan 16, 2025 326
When developing applications in C#, one common requirement is to handle text that exceeds the available space in a UI element, like a label or a text box.
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Editing the Windows Registry in C#
By Tan Lee Published on Jan 16, 2025 431
In this tutorial, we'll explore how to edit the Windows registry using C#. We will cover the steps to create new keys and values, as well as modify existing ones.
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