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Looping:

Variable declarations:

int max;
for(int i=1;i<max;i++){
}

become:

int max,i=1;
for(;i<max;i++){
}

And if you have a need to or work with the i variable only once, you could start at -1 (or 0 depending on the loop circumstance) and increment inline:

int max,i=1;
for(;i<max;i++){
 Console.WriteLine(i);
}

to

int max,i=1;
for(;i<max;){
 Console.WriteLine(++i);
}

And that reduces by one character, and slightly obfuscates the code as well. Only do that to the FIRST i reference, like thus: (granted one character optimizations aren't much, but they can help)

int max,i=1;
for(;i<max;i++){
 Console.WriteLine(i + " " + i);
}

to

int max,i=1;
for(;i<max;){
 Console.WriteLine(++i + " " + i);
}

Looping:

Variable declarations:

int max;
for(int i=1;i<max;i++){
}

become:

int max,i=1;
for(;i<max;i++){
}

And if you have a need to or work with the i variable only once, you could start at -1 (or 0 depending on the loop circumstance) and increment inline:

int max,i=1;
for(;i<max;i++){
 Console.WriteLine(i);
}

to

int max,i=1;
for(;i<max;){
 Console.WriteLine(++i);
}

And that reduces by one character, and slightly obfuscates the code as well. Only do that to the FIRST i reference, like thus: (granted one character optimizations aren't much, but they can help)

int max,i=1;
for(;i<max;i++){
 Console.WriteLine(i + " " + i);
}

to

int max,i=1;
for(;i<max;){
 Console.WriteLine(++i + " " + i);
}

when the loop does not have to increment i (reverse order loop):

for(int i=MAX;--i>0;){
 Console.WriteLine(i);
}