# Expression.NotEqual Method

## Definition

Creates a BinaryExpression that represents an inequality comparison.

## Overloads

NotEqual(Expression, Expression) |
Creates a BinaryExpression that represents an inequality comparison. |

NotEqual(Expression, Expression, Boolean, MethodInfo) |
Creates a BinaryExpression that represents an inequality comparison. |

## NotEqual(Expression, Expression)

Creates a BinaryExpression that represents an inequality comparison.

```
public:
static System::Linq::Expressions::BinaryExpression ^ NotEqual(System::Linq::Expressions::Expression ^ left, System::Linq::Expressions::Expression ^ right);
```

`public static System.Linq.Expressions.BinaryExpression NotEqual (System.Linq.Expressions.Expression left, System.Linq.Expressions.Expression right);`

`static member NotEqual : System.Linq.Expressions.Expression * System.Linq.Expressions.Expression -> System.Linq.Expressions.BinaryExpression`

`Public Shared Function NotEqual (left As Expression, right As Expression) As BinaryExpression`

#### Parameters

- left
- Expression

An Expression to set the Left property equal to.

- right
- Expression

An Expression to set the Right property equal to.

#### Returns

A BinaryExpression that has the NodeType property equal to NotEqual and the Left and Right properties set to the specified values.

#### Exceptions

`left`

or `right`

is `null`

.

The inequality operator is not defined for `left`

.Type and `right`

.Type.

### Remarks

The resulting BinaryExpression has the Method property set to the implementing method. The Type property is set to the type of the node. If the node is lifted, the IsLifted property is `true`

. Otherwise, it is `false`

. The IsLiftedToNull property is always `false`

. The Conversion property is `null`

.

The following information describes the implementing method, the node type, and whether a node is lifted.

#### Implementing Method

The following rules determine the implementing method for the operation:

If the Type property of either

`left`

or`right`

represents a user-defined type that overloads the inequality operator, the MethodInfo that represents that method is the implementing method.Otherwise, the implementing method is

`null`

.

#### Node Type and Lifted versus Non-Lifted

If the implementing method is not `null`

:

If

`left`

.Type and`right`

.Type are assignable to the corresponding argument types of the implementing method, the node is not lifted. The type of the node is the return type of the implementing method.If the following two conditions are satisfied, the node is lifted and the type of the node is Boolean:

`left`

.Type and`right`

.Type are both value types of which at least one is nullable and the corresponding non-nullable types are equal to the corresponding argument types of the implementing method.The return type of the implementing method is Boolean.

If the implementing method is `null`

:

## NotEqual(Expression, Expression, Boolean, MethodInfo)

Creates a BinaryExpression that represents an inequality comparison.

```
public:
static System::Linq::Expressions::BinaryExpression ^ NotEqual(System::Linq::Expressions::Expression ^ left, System::Linq::Expressions::Expression ^ right, bool liftToNull, System::Reflection::MethodInfo ^ method);
```

`public static System.Linq.Expressions.BinaryExpression NotEqual (System.Linq.Expressions.Expression left, System.Linq.Expressions.Expression right, bool liftToNull, System.Reflection.MethodInfo method);`

`static member NotEqual : System.Linq.Expressions.Expression * System.Linq.Expressions.Expression * bool * System.Reflection.MethodInfo -> System.Linq.Expressions.BinaryExpression`

`Public Shared Function NotEqual (left As Expression, right As Expression, liftToNull As Boolean, method As MethodInfo) As BinaryExpression`

#### Parameters

- left
- Expression

An Expression to set the Left property equal to.

- right
- Expression

An Expression to set the Right property equal to.

- liftToNull
- Boolean

`true`

to set IsLiftedToNull to `true`

; `false`

to set IsLiftedToNull to `false`

.

- method
- MethodInfo

A MethodInfo to set the Method property equal to.

#### Returns

A BinaryExpression that has the NodeType property equal to NotEqual and the Left, Right, IsLiftedToNull, and Method properties set to the specified values.

#### Exceptions

`left`

or `right`

is `null`

.

`method`

is not `null`

and the method it represents returns `void`

, is not `static`

(`Shared`

in Visual Basic), or does not take exactly two arguments.

`method`

is `null`

and the inequality operator is not defined for `left`

.Type and `right`

.Type.

### Remarks

The resulting BinaryExpression has the Method property set to the implementing method. The Type property is set to the type of the node. If the node is lifted, the IsLifted property is `true`

and the IsLiftedToNull property is equal to `liftToNull`

. Otherwise, they are both `false`

. The Conversion property is `null`

.

The following information describes the implementing method, the node type, and whether a node is lifted.

#### Implementing Method

The following rules determine the implementing method for the operation:

If

`method`

is not`null`

and it represents a non-void,`static`

(`Shared`

in Visual Basic) method that takes two arguments, it is the implementing method.Otherwise, if the Type property of either

`left`

or`right`

represents a user-defined type that overloads the inequality operator, the MethodInfo that represents that method is the implementing method.Otherwise, the implementing method is

`null`

.

#### Node Type and Lifted versus Non-Lifted

If the implementing method is not `null`

:

If

`left`

.Type and`right`

.Type are assignable to the corresponding argument types of the implementing method, the node is not lifted. The type of the node is the return type of the implementing method.If the following two conditions are satisfied, the node is lifted; also, the type of the node is nullable Boolean if

`liftToNull`

is`true`

or Boolean if`liftToNull`

is`false`

:`left`

.Type and`right`

.Type are both value types of which at least one is nullable and the corresponding non-nullable types are equal to the corresponding argument types of the implementing method.The return type of the implementing method is Boolean.

If the implementing method is `null`

: