Does Web.config file is case-sensitive in ASP.NET?
No, the web.config file in ASP.NET is not case-sensitive. The XML-based structure of the web.config file is case-insensitive by default.
This means that element names, attribute names, and attribute values within the web.config file can be written using any combination of uppercase and lowercase letters. The XML parser in ASP.NET treats them as case-insensitive and does not differentiate between them.
For example, the following lines in the web.config file would be considered equivalent:
<authentication mode="Forms" />
<Authentication Mode="Forms" />
<AUTHENTICATION mode="Forms" />
All three versions are valid and will be interpreted in the same way by the ASP.NET runtime.
However, it's worth noting that the values within the elements or attributes themselves, such as connection strings or URL paths, might be case-sensitive depending on their usage within the application code or external systems. In such cases, it's important to follow the correct case sensitivity as required by the specific context where the values are being used.