Asp net 5 not running in development mode


ASP.NET is a popular programming language used for web applications. However, sometimes may encounter while running ASP.NET applications in development mode. One common problem is when ASP.NET 5 is not running in development mode. In this article, we will explore the possible causes of this issue and provide solutions to resolve it.

Possible Causes

There can be reasons why ASP.NET 5 is not running in development mode. Let's discuss some of the common causes:

Missing Environment Variable

One possible cause is the absence of the ASPNETCORE_ENVIRONMENT environment variable. This variable is used to specify the application's environment, such as development, staging, or production. If this variable is not set or set incorrectly, ASP.NET may not run in the desired mode.

: Setting the Environment Variable

To resolve this issue, you need to set the ASPNETCORE_ENVIRONMENT environment variable to “Development.” Here's an example of how to set the environment variable in ASP.NET:

// Set the environment variable to "Development"
Environment.SetEnvironmentVariable("ASPNETCORE_ENVIRONMENT", "Development");

By setting the environment variable to “Development,” ASP.NET will run in the desired mode.

Missing Configuration

Another possible cause is the absence of the necessary configuration for development mode. ASP.NET requires specific configuration settings to run in development mode, such as connection strings, logging settings, and other environment-specific configurations.

Solution: Adding Development Configuration

To resolve this issue, you need to ensure that the necessary configuration settings are present for development mode. Here's an example of how to add development configuration in ASP.NET:

// Add development configuration
services.(options =>

services.AddLogging(logging =>

By adding the required configuration settings for development mode, ASP.NET will run smoothly in the desired mode.

Missing Development Packages

It is also possible that some development packages are missing from your ASP.NET project. These packages are essential for running ASP.NET in development mode and may cause issues if not installed.

Solution: Installing Development Packages

To resolve this issue, you need to ensure that all the required development packages are installed in your ASP.NET project. You can use the NuGet Package Manager to install the necessary packages. Here's an example of how to install development packages using the Package Manager Console:

// Install development packages
Install-Package Microsoft..Diagnostics. -Version 5.0.0
Install-Package Microsoft.AspNetCore..EntityFrameworkCore -Version 5.0.0

By installing the required development packages, ASP.NET will have all the necessary components to run in development mode.


Running ASP.NET 5 in development mode is crucial for efficient web application development. By the solutions provided in this article, you can resolve the issue of ASP.NET 5 not running in development mode. Remember to set the environment variable, add the necessary configuration, and install the required development packages to ensure smooth operation in development mode.

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