// Before — ?? has lower priority than +
int capacity = length + prependStr?.Length ?? 0 + appendStr?.Length ?? 0;

// After
int capacity = length + (prependStr?.Length ?? 0) + (appendStr?.Length ?? 0);

// Before
private static bool logInitialized = false;

// After
private static volatile bool logInitialized = false;

// Before — RunspaceRef used before null check
if (_isRunspacePushed)
    return RunspaceRef.OldRunspace as LocalRunspace;
if (RunspaceRef == null) return null;

// After — null check first
if (RunspaceRef == null) return null;
if (_isRunspacePushed)
    return RunspaceRef.OldRunspace as LocalRunspace;

// Before
CimInstance instance = GetCimInstanceParameter(cmdlet);
nameSpace = instance.CimSystemProperties.Namespace;

// After
CimInstance instance = GetCimInstanceParameter(cmdlet);
if (instance != null)
{
    nameSpace = instance.CimSystemProperties.Namespace;
    ...
}

// Before
this.Module = other.Members["Module"].Value as ShowCommandModuleInfo;

// After
this.Module = other.Members["Module"]?.Value as ShowCommandModuleInfo;

// Before — vd.mainControl accessed when vd == null
if (vd == null || mainControlType != vd.mainControl.GetType())
{
    ActiveTracer.WriteLine("NOT MATCH {0}", ControlBase.GetControlShapeName(vd.mainControl), ...);
}

// After — separate checks
if (vd == null)
{
    ActiveTracer.WriteLine("NOT MATCH null view definition");
    continue;
}
if (mainControlType != vd.mainControl.GetType()) { ... }