Implemented the program

Employees/Employee.cs

@@ -15,10 +15,9 @@ public abstract class Employee
     /// <param name="department">Department the employee works at</param>
     protected Employee(string name, Gender gender, string department)
     {
-        Name = string.Empty;
-        Gender = Gender.Divers;
-        Department = string.Empty;
-        // TODO
+        Name = name;
+        Gender = gender;
+        Department = department;
     }
 
     /// <summary>
@@ -29,7 +28,14 @@ public abstract class Employee
         get => _name;
         private init
         {
-            // TODO
+            if(value.Length < 2 || !char.IsUpper(value[0]) || char.IsDigit(value[0]))
+            {
+                _name = "ERROR";
+            }
+            else
+            {
+                _name = value;
+            }
         }
     }
 
@@ -54,8 +60,14 @@ public abstract class Employee
     /// <returns>String representation of the employee</returns>
     public override string ToString()
     {
-        // TODO
-        return string.Empty;
+        string result = $"My name is {Name}";
+        if (Gender != Gender.Divers)
+        {
+            string genderString = $"{Gender}";
+            result += $", I identify as {genderString.ToLower()}";
+        }
+        result += $" and I work at the department {Department}";   
+        return result;
     }
 }
 

Employees/Manager.cs

@@ -19,7 +19,7 @@ public sealed class Manager : OfficeEmployee
     /// <summary>
     ///     Gets the actual salary for the manger, which is higher than the base salary
     /// </summary>
-    public override decimal Salary => -1M; // TODO
+    public override decimal Salary => base.Salary * 1.2M;
 
-    public override string ToString() => string.Empty; // TODO
+    public override string ToString() => $"My name is {Name} and I'm head of the {Department} department";
 }

Employees/OfficeEmployee.cs

@@ -16,10 +16,10 @@ public class OfficeEmployee : Employee
     public OfficeEmployee(string name, Gender gender, string department,
                           decimal monthlySalary) : base(name, gender, department)
     {
-        // TODO
+        Salary = Math.Max(0M, monthlySalary);
     }
 
     public override decimal Salary { get; }
 
-    public override string ToString() => string.Empty; // TODO
+    public override string ToString() => $"{base.ToString()} as an employee";
 }

Employees/Worker.cs

@@ -34,7 +34,8 @@ public sealed class Worker : Employee
     public Worker(string name, Gender gender, string department, double hours, decimal hourlyWage)
         : this(name, gender, department)
     {
-        // TODO
+        Hours = hours;
+        HourlyWage = hourlyWage;
     }
 
     /// <summary>
@@ -44,7 +45,7 @@ public sealed class Worker : Employee
     public double Hours
     {
         get => _hours;
-        set => _hours = -1D; // TODO
+        set => _hours = Math.Clamp(value, 0, MaxMonthlyWorkHours);
     }
 
     /// <summary>
@@ -54,10 +55,10 @@ public sealed class Worker : Employee
     public decimal HourlyWage
     {
         get => _hourlyWage;
-        set => _hourlyWage = -1M; // TODO
+        set => _hourlyWage = Math.Max(0, value);
     }
 
-    public override decimal Salary => -1M; // TODO
+    public override decimal Salary => (decimal)Hours * HourlyWage;
 
-    public override string ToString() => string.Empty; // TODO
+    public override string ToString() => $"{base.ToString()} as a worker";
 }