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    <h2>For searching an object in a dictionary using the ContainsKey or ContainsValue keyword, compiler uses two implicit functions i.e. GetHashCode() and Equals(). So when we have an object for comparison, we need to Override both these methods !!</h2> <p>Here is the code</p> <pre><code>#region USING DICTIONARY TO STORE CLASS OBJECTS (check employee existence and print manager's name) public class employee { public string empname { get; set; } public string location { get; set; } public double kinid { get; set; } public double managerKin { get; set; } //public override bool Equals(object obj) // ANY OF THE TWO EQUALS METHOD WORKS. //{ // employee otheremployee; // otheremployee = (employee)obj; // return (otheremployee.kinid == this.kinid &amp;&amp; otheremployee.location == this.location &amp;&amp; otheremployee.empname == this.empname &amp;&amp; otheremployee.managerKin == this.managerKin); //} public override bool Equals(object obj) //When Running this entire code, put a break-point on both the Equals() and GetHashCode() methods, and see the execution flow. { employee otheremployee; otheremployee = (employee)obj; return (obj.GetHashCode() == otheremployee.GetHashCode()); } public override int GetHashCode() //When Running this entire code, put a break-point on both the Equals() and GetHashCode() methods, and see the execution flow. { //int temp = base.GetHashCode(); // DONT USE THIS //return base.GetHashCode(); int temp = empname.GetHashCode() + location.GetHashCode() + kinid.GetHashCode() + managerKin.GetHashCode(); return temp; } } public class manager { public string managername { get; set; } public double kinid { get; set; } public override int GetHashCode() { return base.GetHashCode(); } public override bool Equals(object obj) { return base.Equals(obj); } } public class program { public static void Main() { employee emp = new employee(); employee emp2 = new employee(); manager mng = new manager(); manager mng2 = new manager(); emp.empname = "Deepak"; emp.location = "Pune"; emp.kinid = 36885; emp.managerKin = 007; emp2.empname = "Astha"; emp2.location = "Pune"; emp2.kinid = 30000; emp2.managerKin = 001; mng.kinid = 007; mng.managername = "Gaurav"; mng2.kinid = 001; mng2.managername = "Surya"; Dictionary&lt;employee, manager&gt; relations = new Dictionary&lt;employee, manager&gt;(); relations.Add(emp, mng); // put a BreakPoint here and see the execution flow relations.Add(emp2, mng2);// put a BreakPoint here and see the execution flow Console.ForegroundColor = ConsoleColor.Yellow; Console.WriteLine("The Employee details are :"); foreach (var element in relations) Console.WriteLine(" \n Employee Name : {0} \n Location : {1} \n Employee KinId : {2} \n Manager's KinId : {3} ", element.Key.empname, element.Key.location, element.Key.kinid, element.Key.managerKin); Console.WriteLine("Enter the details of the Employee.."); Console.ForegroundColor = ConsoleColor.Gray; Console.Write("\nEmployee Name : "); string ename = Console.ReadLine(); Console.Write("Location : "); string elocn = Console.ReadLine(); Console.Write("Employee KinId : "); double ekinid = Convert.ToDouble(Console.ReadLine()); Console.Write("Manager's ID : "); double emngr = Convert.ToDouble(Console.ReadLine()); employee emp1 = new employee(); emp1.empname = ename; emp1.location = elocn; emp1.kinid = ekinid; emp1.managerKin = emngr; int i = 0; // This variable acts as a indicator to find whether the Employee Key exists or not. if (relations.ContainsKey(emp1)) //Put a break point here and see the execution flow. { Console.WriteLine("the Employee : {0} exists..", emp1.empname); Console.WriteLine("the Employee reports to the following manager : {0} \n and the Manager's KinId is {1}.", (relations[emp1]).managername, relations[emp1].kinid); i = 1; Console.ReadLine(); } if (i == 0) { Console.WriteLine("the details of the employee named {0} does not exist !!", emp1.empname); Console.ReadLine(); } #endregion </code></pre>
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