C# code is not inherently secure or insecure. Any security vulnerabilities that a program may have are caused by the person that wrote the program, not the language they used to do it.

ya vulnerabilities are depends on developer of the code..but i jus wanna know possibilities of security vulnerabilities in c# code tat may leads to high risk..for eg:buffer overflow.

The biggest vulnerability is either the rookie programmer who is left to his own devices, or an experienced programmer that assumes too much.

The language itself (and the .Net Framework in general) are NOT the problem with regards to security.