In c#, const is a keyword that is useful to declare constant fields in our applications. Generally, in c#, constant field values are set at compile-time, and those values will never change.
In c#, if we use
const keyword to declare a constant field, then that field value cannot be changed throughout the application, so we should not use
const keyword with the fields whose value will be changed at any time.
To define constant fields in c#, we need to use
const keyword during the declaration of fields in our application, and we can use constants with numbers, boolean values, strings, or null references.
It’s mandatory to initialize constant fields with required values during the declaration itself; otherwise, we will get compile-time errors in our c# application.
In c#, the static modifier is not allowed to use during the declaration of constant variables.
Following is the syntax of defining constant fields using
const keyword in c# programming language.
const data_type field_name = "value";
If you observe the above syntax, we used a
const keyword declares a constant variable in our application.
The following are the different ways of declaring and initializing constant variables in the c# programming language.
If you observe the above examples, we created constant fields with different data types based on our requirements.
Following is the example of defining and using constant fields in c# programming language with
If you observe the above example, we created constant fields with different data types, and if we uncomment the commented code, we will get a compile-time error because we are trying to change the value of constant fields.
As discussed, once the constant field is declared and initialized, the field value must be the same throughout the application.
When we run the above c# program, we will get the result as shown below.
The following are the important features of a constant variable in the c# programming language.
This is how we can use constant fields in our c# programming language based on our requirements.