System.Security.SecureString
namespace System.Security
{
public sealed class SecureString : IDisposable
{
public int Length { get; }
public SecureString();
public unsafe SecureString(char* value, int length);
public void AppendChar(char c);
public void Clear();
public SecureString Copy();
public void Dispose();
public void InsertAt(int index, char c);
public bool IsReadOnly();
public void MakeReadOnly();
public void RemoveAt(int index);
public void SetAt(int index, char c);
}
}