Sort the Array without inbuild function

 Sorting by ascending order 

int[] Arrayorder = {3,7,4,1,2,9,8 };

int temp;

for (int i = 0; i < Arrayorder.Length-1; i++)

{

    for (int j = i+1; j < Arrayorder.Length; j++)

    {

        if (Arrayorder[i] > Arrayorder[j])

        {

            temp = Arrayorder[i];

            Arrayorder[i] = Arrayorder[j];

            Arrayorder[j] = temp;

        } 

    }

}

foreach (int i in Arrayorder)

{

    Console.WriteLine(i);

}

Output:

 Sorting by Descending order 

int[] Arrayorder = {3,7,4,1,2,9,8 };

int temp;

for (int i = 0; i < Arrayorder.Length-1; i++)

{

    for (int j = i+1; j < Arrayorder.Length; j++)

    {

        if (Arrayorder[i] < Arrayorder[j])

        {

            temp = Arrayorder[i];

            Arrayorder[i] = Arrayorder[j];

            Arrayorder[j] = temp;

        }

    }

}

foreach (int i in Arrayorder)

{

    Console.WriteLine(i);

}

Output: