using static System.Console;
 
public class Program {
    public static void Main() {
        int[,] array = new int[10,10];
        for (int l = 0; l < 10; l++) {
            for (int c = 0; c < 10; c++) array[l, c] = c;
        }
        for (int l = 0; l < 10; l++) {
            for (int c = 0; c < 10; c++) Write($"{array[l, c]} ");
            WriteLine();
        }
        WriteLine();
        for (int l = 0; l < 10; l++) {
            for (int c = l; c < 10; c++) { // <========== mudei aqui, veja o l
                int temp = array[l, c];
                array[l, c] = array[c, l];
                array[c, l] = temp;
            }
        }
        for (int l = 0; l < 10; l++) {
            for (int c = 0; c < 10; c++) Write($"{array[l, c]} ");
            WriteLine();
        }
    }
}
 
//https://pt.stackoverflow.com/q/220469/101

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