Pass null as parameter

You need pass DBNull. Value as a null parameter within SQLCommand, unless a default value is specified within stored procedure if you are using stored procedure. The best approach is to assign DBNull. Value for any missing parameter before query execution, and following foreach will do the job. The DBNull class represents a nonexistent value.

In a database, for example, a column in a row of a table might not contain any data whatsoever. That is, the column is considered to not exist at all instead of merely not having a value.

A DBNull object represents the nonexistent column. February 21, In database management, a field that is allowed to have no values is called nullable.

Depending on the application, nullable may also be called a null reference or null object. If the parameter has value then only matching records will be returned, while if the parameter is Null or Blank Empty then all records from the table will be returned.

In Java it is very common to overload methods. When we pass a null value to the method1 the compiler gets confused which method it has to select, as both are accepting the null. Here the function is called with a nullable argument, and if the argument was null, the function will return null, and if not it will return a proper value.

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Clears the value of the Parameter text box if checked and enables the Parameter text box if not checked. DBNull indicates that the object represents missing or nonexistent data, typically in a database, while null and Nothing indicate that an object or variable has not yet been initialized. Passing a null parameter value into a stored procedure is not very different than passing any other parameter value.

Construct the parameter using either the Parameter constructor or the Add method of the ParameterCollection for the Command object. The value is set by passing System. Value for the value argument when constructing the parameter or by setting the Value property of the Parameter object to System. To test for a null value, the IsDBNull method returns a Boolean value that indicates whether an object expression evaluates to System. This is the same as comparing an object to the System.

Value using an equality operator. If the stored procedure accepts optional parametersparameters for which a default value is specifiedyou can set these parameters to null in C or Nothing in VB. This is not the same as setting the parameter value to System.

The parameter value is set to the default value specified for the parameter. Previous page. Table of content. Next page. General Considerations A. Classes A.