SPC050101: Do not use spaces in file or folders names
SPC050201: Instantiate a new SPSite inside RunWithElevatedPrivileges
SPC050222: Do not call SPList.Items
SPC050223: Do not call SPList.Items.GetItemById()
SPC050224: Do not call SPList.Items[]
SPC050225: Do not call SPList.Items.Count
SPC050226: Do not call SPListItemVersion.Delete to delete multiple versions
SPC050227: Do not call SPFileVersion.Delete to delete multiple versions
SPC050228: Do not enable ObjectTracking in Linq.DataContext
SPC050229: Do not access SPListCollection by indexer multiple times
SPC050230: Do not call SPFolder.Files.Count
SPC050231: Use SPBuiltInContentTypeId to reference builtin ContentType
SPC050232: Use SPBuiltInFieldId to reference builtin Field
SPC050233: Define RowLimit for SPQuery
SPC050234: Avoid using AppSettings to store configuration values
SPC050235: Apply lock when caching SharePoint objects
SPC050236: Do not call SPItemEventProperties.OpenWeb()
SPC050237: Do not request SPField from SPFieldCollection by index. Use SPFieldCollection.GetField() instead.
SPC050238: Do not call SPWeb.GetListFromUrl. Use SPWeb.GetListFromWebPartPageUrl instead.
SPC050250: Assign RowLimit for SPQuery in limited range
SPC052101: Do not activate or deactivate Features via API
SPC052201: Custom field types should not be user creatable
SPC055201: Consider using SPContentTypeCollection.BestMatch(SPContentTypeId) to retrieve a Content Type
SPC055501: Define Type of ListTemplate greater than 10000
SPC056001: Do not instantiate SPList in Receiver
SPC056002: Do not instantiate SPListItem in Receiver
SPC056003: Do not instantiate SPSite in Receiver
SPC056004: Do not instantiate SPWeb in Receiver

SPC050237: Do not request SPField from SPFieldCollection by index. Use SPFieldCollection.GetField() instead.

Calling SPFieldCollection[] to retrieve a SPField in a web could fail if not the display name is used as argument. Better use SPWeb.Fields.GetField() which returns the field with the specified internal, display, or static name.

TypeName: DoNotUseFieldCollectionByIndex
CheckId: SPC050237
Severity: CriticalWarning
Type: AssemblyFileReference
Resolution

Replace calls to SPFieldCollection[] with SPFieldCollection.GetField(). SharePoint searches first by internal name; then, if necessary, by display name; finally, if necessary, by static name.

Bad Practice:

SPWeb myWeb = SPContext.Current.Web;
SPField newField = web.Fields["FieldName"]; // could fail if FieldName is not the display name
Good Practice:
SPWeb myWeb = SPContext.Current.Web;
SPField newField = web.Fields.GetField("FieldName");

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