2-d (Dimensional) ARRAY in C#

Two dimensional arrays are those arrays which are used to maintain data in the form of row and column. It stored in tabular format.
Declaration of 2D array

Int [,] marks = new int [3, 4];
For (int i = 0; i<3; i++)
{
For (int j=0; j<4; j++)
{
Marks [I,j] = 34;
}
}