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    <p>There are two approaches to this problem:</p> <p>Create a base class that has all these common properties and derive the others from it.</p> <pre><code>public abstract class MyBaseClass { public string Name { get; set; } public string Signature { get; set; } public int Checksum { get; set; } } public class ClassX : MyBaseClass { // Add the other properties here } public class ClassY : MyBaseClass { // Add the other properties here } public class ClassZ : MyBaseClass { // Add the other properties here } </code></pre> <p>Your helper method will have a parameter of type MyBaseClass:</p> <pre><code>public void MyHelperMethod(MyBaseClass obj) { // Do something with obj.Name, obj.Siganture and obj.Checksum } </code></pre> <p>It would also be a good idea to place the helper method in MyBaseClass, but without parameters, since now it can access the properties directly:</p> <pre><code>public abstract class MyBaseClass { public string Name { get; set; } public string Signature { get; set; } public int Checksum { get; set; } public void CreateChecksum() // Your helper method { Checksum = Name.GetHashCode() ^ Signature.GetHashCode(); } } </code></pre> <p>Then you can call it directly from your objects:</p> <pre><code>objA.CreateChecksum(); objB.CreateChecksum(); objB.CreateChecksum(); </code></pre> <hr> <p>Or define an interface that your three classes implement:</p> <pre><code>public interface IMyInterface { string Name { get; set; } string Signature { get; set; } int Checksum { get; set; } } public class ClassX : IMyInterface { public string Name { get; set; } public string Signature { get; set; } public int Checksum { get; set; } // Add the other properties here } public class ClassY : IMyInterface { public string Name { get; set; } public string Signature { get; set; } public int Checksum { get; set; } // Add the other properties here } public class ClassZ : IMyInterface { public string Name { get; set; } public string Signature { get; set; } public int Checksum { get; set; } // Add the other properties here } </code></pre> <p>Your helper method will have a parameter of type IMyInterface:</p> <pre><code>public void MyHelperMethod(IMyInterface obj) { // Do something with obj.Name, obj.Siganture and obj.Checksum } </code></pre> <hr> <p>You can call MyHelperMethod like this</p> <pre><code>MyHelperMethod(objA); MyHelperMethod(objB); MyHelperMethod(objC); </code></pre>
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