Using Visual Studio Edit and Continue to Tweak Code While Debugging

Why stopping the debugger hurts productivity

When you hit a breakpoint, make a small change to fix a logic error, and then have to stop, rebuild, and launch the debugger again, you lose the current call stack, variable values, and any temporary state you were examining. This interruption adds friction to the inner‑loop of development, especially when you are iterating on a single method.

Enabling Edit and Continue in Visual Studio

Edit and Continue works for projects that target .NET Framework or .NET Core. To turn it on:

1. Open Debug → Options… from the main menu.
2. Select General under the Debugging node.
3. Check the box labeled Enable Edit and Continue.
4. Click OK.

Make sure you are using Visual Studio 2019 version 16.8 or later for .NET Core support; earlier versions only provide the feature for .NET Framework.

Worked example: changing a return value while stopped

Consider a simple console application:

using System;

class Program
{
    static int Add(int a, int b)
    {
        return a + b;          // <-- breakpoint here
    }

    static void Main()
    {
        Console.WriteLine(Add(2, 3));
    }
}

Set a breakpoint on the return statement inside Add, start debugging (F5), and hit the breakpoint. While the debugger is paused:

1. Edit the line to read return a + b + 1;.
2. Press F5 (or click Continue) to resume execution.
3. The program will now print 6 instead of 5, reflecting the change without a restart.

If the edit is incompatible (for example, you change the method signature to Add(int a, int b, int c)), Visual Studio will display a warning and require you to stop and rebuild before continuing.

Limitations and how to verify the feature worked

Edit and Continue cannot apply certain edits while debugging:

• Adding, removing, or renaming types or members.
• Changing method signatures (parameter types, return type, or ref/out modifiers).
• Modifying native code or mixed‑mode assemblies.
• Editing async state machine methods in some scenarios.

When an edit is successfully applied, you can check two places:

1. Diagnostic Tools window – while in break mode, look for a Code Changes indicator that appears near the top of the window.
2. Output window – a message like Applied code changes. is written when the runtime accepts the edit.

If you do not see these signs, the edit was not applied and you will need to stop, rebuild, and continue.

Actionable takeaway

Edit and Continue lets you stay inside the debugging session for small, safe code tweaks, preserving your inspection context and shortening the feedback loop. Enable it once per solution, remember the edit restrictions, and use the Diagnostic Tools window to confirm that your changes took effect. When you hit a limitation, accept the brief restart cost and move on—knowing that the feature is there for the majority of routine adjustments.