how to get the max integer number in c# code example

Example: c# how to check the minimum and maximum of numbers

maxValue = F4 (F4) {
    mxm = F4[0];
    for (i=0; i<F4.length;>
       if (F4[i]>mxm) {    
                mxm = F4[i];    
       }
    }
    return mxm;
};