create double for each metod in csharp

A double for loop, also known as a nested loop, is a loop construct in C# that allows you to iterate over two collections or arrays simultaneously. Here's an example of how to create a double for loop in C#:

main.cs
for (int i = 0; i < array1.Length; i++)
{
    for (int j = 0; j < array2.Length; j++)
    {
        // work with array1[i] and array2[j]
    }
}
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In this example, we have two arrays array1 and array2, and we want to iterate over both of them. The outer loop iterates over array1 using the loop variable i, and the inner loop iterates over array2 using the loop variable j. Within the loop body, you can work with array1[i] and array2[j] to perform some operation or computation.

Double for loops are commonly used in matrix operations or multi-dimensional arrays, where you need to iterate over each element of the matrix or array.