SPFieldCollection.Add method (String, SPFieldType, Boolean)

Creates a field in the collection based on the specified display name, field type, and Boolean value.

Namespace:  Microsoft.SharePoint
Assembly:  Microsoft.SharePoint (in Microsoft.SharePoint.dll)

public string Add(
	string strDisplayName,
	SPFieldType type,
	bool bRequired


Type: System.String

A string that specifies the display name of the field.

Type: Microsoft.SharePoint.SPFieldType

A SPFieldType value that specifies the type of field to create.

Type: System.Boolean

true if the field is required to contain a value; otherwise, false.

Return value

Type: System.String
A string that contains the internal name of the new field.

The Add method cannot be used to create a field of type Lookup, because this causes an SPException to be thrown. Instead use the AddLookup method to add a field of this type.

The following code example adds a required text field to the specified list.

using (SPWeb oWebsite = SPContext.Current.Site.AllWebs["MySite"])
    SPFieldCollection collFields = oWebsite.Lists["MyList"].Fields;
    collFields.Add("MyField", Microsoft.SharePoint.SPFieldType.Text, 

Certain objects implement the IDisposable interface, and you must avoid retaining these objects in memory after they are no longer needed. For information about good coding practices, see Disposing Objects.