does anyone know how to how can i change the OperationName of a certain request in .Net for signoz

I suppose it depends on the instrumentation. In case of manual instrumentation, you can set the operation name using

StartActiveSpan

as well as

UpdateName

functions as shown in below example. https://github.com/open-telemetry/opentelemetry-dotnet/blob/main/examples/Console/TestOTelShimWithConsoleExporter.cs#L39-L45