asp.net (C #) is inaccessible because it is limited by the protection level _ practical Tips

Today, when you write a complex number of errors, the original code is streamlined as follows:

public class Complex
{
Constructors
Complex (double R, double i)
{
Complex_real = R;
Complex_imagin = i;
}
}

It's depressing here, Java write this is no problem, and C # but there is a big demand for this, in some cases, must be declared public, but such errors are generally caused by modifier errors, such as the original should be used public you have used private or nothing to write:

Private is privately variable
Public is a shared variable
The modified code is as follows:

public class Complex
{
Constructors
Public complex (double R, double i)
{
Complex_real = R;
Complex_imagin = i;
}
}