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SharePoint 2013
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Microsoft.SharePoint
SPField class
SPField properties
AggregationFunction property
AllowDeletion property
AuthoringInfo property
CalloutMenu property
CalloutMenuAllowed property
CanBeDeleted property
CanBeDisplayedInEditForm property
CanToggleHidden property
CompositeIndexable property
DefaultFormula property
DefaultListField property
DefaultValue property
DefaultValueTyped property
Description property
DescriptionResource property
Direction property
DisplaySize property
EnforceUniqueValues property
EntityPropertyName property
FieldReferences property
FieldRenderingControl property
FieldRenderingMobileControl property
FieldRenderingMobileWebControl property
FieldTypeDefinition property
FieldValueType property
Filterable property
FilterableNoRecurrence property
FromBaseType property
Group property
Hidden property
Id property
IMEMode property
Indexable property
Indexed property
InternalName property
JSLink property
JumpToField property
LinkToItem property
LinkToItemAllowed property
ListItemMenu property
ListItemMenuAllowed property
NoCrawl property
ParentList property
PIAttribute property
PITarget property
PreviewValueTyped property
PrimaryPIAttribute property
PrimaryPITarget property
PushChangesToLists property
ReadOnlyField property
RelatedField property
Reorderable property
Required property
SchemaXml property
SchemaXmlWithResourceTokens property
Scope property
Sealed property
ShowInDisplayForm property
ShowInEditForm property
ShowInListSettings property
ShowInNewForm property
ShowInVersionHistory property
ShowInViewForms property
Sortable property
SourceId property
StaticName property
Title property
TitleResource property
TranslationXml property
Type property
TypeAsString property
TypeDisplayName property
TypeShortDescription property
UsedInWebContentTypes property
ValidationEcmaScript property
ValidationFormula property
ValidationMessage property
Version property
XPath property
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SPField.Required property

SharePoint 2013

Gets or sets a Boolean value that determines whether users must enter a value for the field on New and Edit forms.

Namespace:  Microsoft.SharePoint
Assembly:  Microsoft.SharePoint (in Microsoft.SharePoint.dll)
C#
VB
Copy 
[ClientCallableAttribute]
public bool Required { get; set; }

Property value

Type: System.Boolean
true if the field requires values; otherwise, false.
ExceptionCondition
NotSupportedException

The list that the field belongs to is an external list.

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