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What Is A Default Value
A default value is a preset value defined for a column type or a variable. Default values are used when many records or instances hold similar data. Default values can vary depending on the type of data, such as char, enum, struct, or any nullable value type.
In programming languages like C#, default values are used when no value is provided for an Insert or an Update statement. The default value is the value used when no value is provided for an Insert or an Update statement.
In C#, the default value is whatever you get when you call default (TypeName). For ReferenceTypes, this is invariably null. For ValueTypes, this is typically 0 (for numeric types) or an instance of the struct after its default constructor is called.
The default value produced by setting all value-type fields to their default values and all reference-type fields to null. Any nullable value type. An instance for which the HasValue property is false and the Value property is undefined. That default value is also known as the null value of a nullable value type.
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