String Compare performance

In .NET code, "ToUpper" and "ToLower" methods can impact performance due to memory allocation, string copying, and potential garbage collection, especially in situations involving large strings or frequent conversions.

Performance-wise, string.Equals is faster than the above methods due to direct character comparison, avoiding memory allocation, and reducing overhead for case-insensitive string comparison.

Best approach is to leverage SringComparion.OrdinalIgnoreCase to compare strings using ordinal(binary) sort rules and ignoring the case of the strings being compared.