private void SaveFile_Click(object sender, EventArgs e)
        {
            string fileCSV = "";
            for (int i = 0; i < dataGridView1.RowCount - 1; i++)
            {
                for (int j = 0; j < dataGridView1.ColumnCount; j++)
                {
                    fileCSV += (dataGridView1[j, i].Value).ToString() + ";";
                }
                fileCSV += "\t\n";
            }
            StreamWriter wr = new StreamWriter("test.csv", false, Encoding.GetEncoding("windows-1251"));
            wr.Write(fileCSV);
            wr.Close();

        }