Abstract. As you know, programming in C# requires certain skills. This is a series of theoretical and practical exercises, starting with the C# alphabet and ending with the last lectures. The most basic of the initial concepts is that you should have a complete understanding of how to write numbers (integer, real, and exponential) in C#. Then you can learn how to write expressions based on constants, variables, symbolic concepts, index variables, array concepts, write basic mathematical functions. Further, these are the main representation operators - integer, real and symbolic, assignment, input, output, conditional and unconditional transition, iteration operators. Only later it is necessary to study such topics as the program of the part of the function, the program of the part of the procedure. Elements of programming in practical classes should cover such topics and move from simple to complex. Prepared programs can be run in 2 different modes. One of them is to run in -Console mode. In principle, it is similar to Pascal. However, in terms of features, this language is far superior to it. Therefore, it is desirable to assemble short algorithms and programs based on simple examples from different areas. The proposed work, in addition to providing algorithms and example programs, also provides a brief instruction on how to run programs on a computer. Basically, this is the calculation of the integral using an approximate formula, checking the symmetries of matrices, calculating the product of matrices, processing the results of the experiment, solving transcendental equations by iteration and dividing the interval by two, solving the system of equations using the Cramer method. They are taken because such examples occur in fields of arbitrary natural direction, and their solution in the algorithmic language is always in the foreground. The examples are solved as simply as possible, and instructions for computer implementation are given.