Multiple initialization in C# ‘for’ loop

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It can’t be done. Put one of the declarations before the loop:

MyClass i = 0;
for (int j = 1; j < 3; j++, i++)

Or for symmetry, both of them:

MyClass i = 0;
int j = 1;
for (; j < 3; j++, i++)

It’s also possible that one of the variables is more primary than the other. In that case it might be neater to have one be the loop variable, and deal with the other seperately, like this:

MyClass i = 0;
for (int j = 0; j < 3; j++)
{
    ...
    i++;
}

Note that if i and j were of the same type, then you could declare them both in the for-loop:

for (int i = 0, j = 1; j < 3; j++, i++)

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