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Update method
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SPField.Update method

Updates the database with changes that are made to the field.

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

public virtual void Update()

ExceptionCondition
SPException

An error was encountered during the operation.

The following code example updates the display name, default value, and description for the specified field.

SPSite oSiteCollection = SPContext.Current.Site;
SPList oList = 
    oSiteCollection.AllWebs["Site_Name"].Lists["List_Name"];
SPField oField = oList.Fields["Field_Name"];

oField.DefaultValue = "Default_Value";
oField.Description = "Description";
oField.Title = "New_Field_Title";

oField.Update();
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