Asp.net (c #) is not accessible because it is restricted by the protection level.

The error occurred when I wrote a plural class today. The original code is simplified as follows:

Public class complex
{
// Constructor
Complex (double r, double I)
{
Complex_real = r;
Complex_imagin = I;
}
}

I am very depressed here. It's okay to write JAVA like this, but c # has a lot of requirements for this. In some cases, it must be declared as public, but this error occurs, it is generally caused by modifier errors. For example, you should have used public, but you have used private or nothing to write:

Private is a private variable.
Public is a common variable.
The modified code is as follows:

Public class complex
{
// Constructor
Public complex (double r, double I)
{
Complex_real = r;
Complex_imagin = I;
}
}