The main task of this final paper is to create a Windows desktop application that will represent a graphical display of operations with matrices. The programming language C# was used when writing the program code, and the Microsoft Visual Studio application was used as the development environment. Also, Windows Forms were used as part of the Microsoft .NET platform for graphical display of a total of five forms. The first form represents the initial window of the application in which one of the following operations is selected using the drop-down menu: addition, subtraction, multiplication and multiplication with a scalar. The second form represents a window in which the user enters the dimensions of matrices A and B needed for addition, subtraction and multiplication operations. The third form represents a window for entering the elements of matrices A and B, and its main task is to calculate the resultant matrix by clicking on the button. It also has options that can be performed by clicking on the corresponding button, which include: return to the previous form, return to the initial form and "cleaning" all matrices to their initial state. The fourth form refers to the window in which the user enters the dimensions of the matrix and the scalar required for the operation of multiplying the matrix with a scalar. The last, fifth form represents the entry of matrix elements, and its main task is to calculate the resultant matrix. It has all the same possibilities as the third form with the addition that the user can change the value of the scalar previously entered in the fourth form at any time. The application is resistant to incorrect inputs by the user, for example incorrect input of matrix dimensions, incorrect input of scalar, incorrect input of matrix elements and so on.