Please help me solve below issue.

The way you did your for loops makes me think you may not understand the syntax. If so, let me know and i'll clarify for you.

All you need to do is embed one for loop into the other. Take a look at the values of i and totalcounter once the program is done running. the total number of times i runs is 20 as described when m runs 2 times.

for (int m = 0; m < 2; m++)
{
    for (int i = 0; i < 10; i++)
    {
        Console.WriteLine("i count: {0}",i);
        Console.WriteLine("totalcounter count: {0}", totalcounter);
        totalcounter += 1;
    }
}

Sample output

i count: 0
totalcounter count: 1
i count: 1
totalcounter count: 2
i count: 2
totalcounter count: 3
i count: 3
totalcounter count: 4
i count: 4
totalcounter count: 5
i count: 5
totalcounter count: 6
i count: 6
totalcounter count: 7
i count: 7
totalcounter count: 8
i count: 8
totalcounter count: 9
i count: 9
totalcounter count: 10
i count: 0
totalcounter count: 11
i count: 1
totalcounter count: 12
i count: 2
totalcounter count: 13
i count: 3
totalcounter count: 14
i count: 4
totalcounter count: 15
i count: 5
totalcounter count: 16
i count: 6
totalcounter count: 17
i count: 7
totalcounter count: 18
i count: 8
totalcounter count: 19
i count: 9
totalcounter count: 20

Option 1:

int m;
for (m = 1; m < 4; m++)
{
   for (int j = 1; j <= m * 10; j++)
   {
      for (int i = 10; i < 50; i++)
      {
         // Do work.
      }
   }   
}

Option 2:

void DoWork()
{
   int m;

   for (m = 1; m < 4; m++)
   {
      Process(m);
   }
}

void Process(int multiplier)
{
   for (int count = 1; count <= 10 * multiplier; count ++)
   {
      for (int i = 10; i < 50; i++)
      {
         // Do work.
      }
   }
}

C language is the ancestor of C++ which is the ancestor of C#. They share the same syntax and structures.
Learning C basics shouldn't harm:
The C Programming Language - Wikipedia, the free encyclopedia[^]
https://hassanolity.files.wordpress.com/2013/11/the_c_programming_language_2.pdf[^]
http://www.ime.usp.br/~pf/Kernighan-Ritchie/C-Programming-Ebook.pdf[^]