string check1 = checkBox1.Text;
            string check2 = checkBox2.Text;
            string check3 = checkBox3.Text;
            string check4 = checkBox4.Text;
            string check5 = checkBox5.Text;
            {
                if ((checkBox1.Checked) || (checkBox2.Checked) || (checkBox3.Checked) || (checkBox4.Checked) || (checkBox5.Checked))
                {
                    string Connection="Data Source=MADDY;Initial Catalog=Bookshop;Integrated Security=True";
                    string query = "SELECT  Departments.Department, Employee.Surname, Employee.Name, Employee.LastName, Post.Post FROM Departments INNER JOIN Employee ON Departments.DepartmentID = Employee.DepartmentID INNER JOIN Post ON Employee.PostID = Post.PostID where Departments.Department LIKE '" + check1 + "%'OR Departments.Department LIKE '" + check2 + "%'OR Departments.Department LIKE '" + check3 + "%'ORDepartments.Department LIKE '" + check4 + "%'ORDepartments.Department LIKE '" + check5 + "%'";
                  this.sqlCommand1.CommandText = query;
                    SqlDataAdapter1 da = new SqlDataAdapter(query, Connection);
                    dataSet1 ds = new DataSet();
                    da.Fill(ds, "Employees");