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If a source file has changed and the source no longer matches the code you're debugging, the debugger won't set breakpoints in the code by default. Normally, this problem happens when a source file is changed, but the source code wasn't rebuilt. To fix this issue, rebuild the project.
To set a breakpoint in source code, click in the far left margin next to a line of code. You can also select the line and press F9, select Debug > Toggle Breakpoint, or right-click and select Breakpoint > Insert breakpoint.
Enter break modeBegin code stepping by selecting F10 or F11. Doing so allows you to quickly find the entry point of your app. You can then continue to press step commands to navigate through the code. Run to a specific location or function, for example, by setting a breakpoint and starting your app.
I had the same problem but a different solution. Please note I updated to VS 2015 Update 1 and the problem is still there.
In previous edition of VS starting debug automatically triggered a build in debug mode. But with VS2015 it does not.
So if your last build was in release mode, and you try debugging, breakpoint won't work.
You have to manually build in debug mode first, then start debugging.
I had the same problem.
I solved it disabling "Optimize code" option in project properties Build tab.
This may seem trivial, but after a lot of headscratching with the same issues as you mention, I found out that my build was set to "release" instead of "debug" when I tried debugging.. re-building the solution for "debug" fixed it, and I could set breakpoints as normal
I had a similar issue with breakpoints failing to bind, as well as certain local variables not evaluating in the Locals window. What finally fixed it was enabling the "Suppress JIT optimization on module load (Managed only)" option in the Options->Debug->General tab. Once I set that it was able to bind without issue.
I had this problem. I ran a performance profiling session which modified the Web.config file with settings for the performance monitor:
<appSettings>
<add key="Microsoft.VisualStudio.Enterprise.AspNetHelper.VsInstrLocation" value="C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\Team Tools\Performance Tools\vsinstr.exe"/>
</appSettings>
<compilation debug="true" targetFramework="4.5"
assemblyPostProcessorType="Microsoft.VisualStudio.Enterprise.Common.AspPerformanceInstrumenter, Microsoft.VisualStudio.Enterprise.AspNetHelper, Version=16.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a">
...
</compilation>
<runtime>
<assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
<dependentAssembly>
<assemblyIdentity name="Microsoft.VisualStudio.Enterprise.AspNetHelper" publicKeyToken="b03f5f7f11d50a3a" culture="neutral"/>
<codeBase version="16.0.0.0" href="file:///D:/Program%20Files%20(x86)/Microsoft%20Visual%20Studio/Shared/Common/VSPerfCollectionTools/vs2019/Microsoft.VisualStudio.Enterprise.AspNetHelper.DLL"/>
</dependentAssembly>
<dependentAssembly>
<assemblyIdentity name="VsWebSite.Interop" publicKeyToken="b03f5f7f11d50a3a" culture="neutral"/>
<codeBase version="8.0.0.0" href="file:///D:/Program%20Files%20(x86)/Microsoft%20Visual%20Studio/Shared/Common/VSPerfCollectionTools/vs2019/VsWebSite.Interop.DLL"/>
</dependentAssembly>
</assemblyBinding>
</runtime>
This broke my ability to stop at breakpoints. When I reverted back to the original Web.config (removed the Performance Profiler settings), the breakpoints started working again.
Change Release mode to Debug, In my case, this fixed my problem.
I had the same issue yesterday. I used the "Clean Solution" feature and it helped.
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