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The difference is, that in your first code snippet you're calling the parameterless base class constructor, whereas in your second code snippet you're calling the base class constructor with a parameter.

Your base class might be defined as follows:

class qwe{ public qwe(){ /* Some code */ } public qwe(AnotherClass ac){ /* Some other code */ } } 

The default constructor for your abc class looks exactly like the following:

class abc{ public abc() : base() {} } 

The difference is, that in your first code snippet you're calling the parameterless base class constructor, whereas in your second code snippet you're calling the base class constructor with a parameter.

Your base class might be defined as follows:

class qwe{ public qwe(){ /* Some code */ } public qwe(SomeAnotherclass ac){ /* Some other code */ } } 

The default constructor for your abc class looks exactly like the following:

class abc{ public abc() : base() {} } 

The difference is, that in your first code snippet your calling the parameterless base class constructor, whereas in your second code snippet you're calling the base class constructor with a parameter.

Your base class might be defined as follows:

class qwe{ public qwe(){ /* Some code */ } public qwe(AnotherClass ac){ /* Some other code */ } } 

The default constructor for your abc class looks exactly like the following:

class abc{ public abc() : base() {} } 

The difference is, that in your first code snippet you're calling the parameterless base class constructor, whereas in your second code snippet you're calling the base class constructor with a parameter.

Your base class might be defined as follows:

class qwe{ public qwe(){ /* Some code */ } public qwe(AnotherClass ac){ /* Some other code */ } } 

The default constructor for your abc class looks exactly like the following:

class abc{ public abc() : base() {} } 

The difference is, that in your first code snippet your calling the parameterless base class constructor, whereas in your second code snippet you're calling the base class constructor with a parameter.

Your base class might be defined as follows:

class qwe{ public qwe(){ /* Some code */ } public qwe(AnotherClass ac){ /* Some other code */ } } 

The difference is, that in your first code snippet your calling the parameterless base class constructor, whereas in your second code snippet you're calling the base class constructor with a parameter.

Your base class might be defined as follows:

class qwe{ public qwe(){ /* Some code */ } public qwe(AnotherClass ac){ /* Some other code */ } } 

The default constructor for your abc class looks exactly like the following:

class abc{ public abc() : base() {} }