# ISOMITTED

## Content

This function is used to check whether the value in a [LAMBDA](/document-solutions/dot-net-excel-api/docs/online/Features/ManageFormulas/lambda-functions) is missing and returns TRUE or FALSE.

## Syntax

`ISOMITTED(argument)`

## Arguments

[Required] The value you want to test, such as a LAMBDA parameter.

## Examples

`LAMBDA(x,y, IF(ISOMITTED(y),"Missing second argument",x+y))(1,)`