Change connector label

An example of changing the label of a connector displayed on a diagram.
The connector label is assigned a connector field, and changing the field value changes the label display.

public void ModifyConnectorLabel(ICommandContext c, ICommandParams p) 
{ 
//Get the currently displayed diagram 
IDiagram diagram = c.App.Workspace.CurrentEditor as IDiagram; 
if (diagram == null) 
{ 
//End processing if no diagram is displayed 
c.App.Output.WriteLine("sample", "No diagram displayed"); 
return; 
} 

//Get the connectors selected on the diagram 
IEnumerable<IConnector> connectors = diagram.GetSelectedShapes().OfType<IConnector>().ToList(); 
if (!connectors.Any()) 
{ 
c.App.Output.WriteLine("sample", "No connector selected"); 
return; 
} 

//Update the labels of the obtained connectors 
foreach(IConnector connector in connectors) 
{ 
//Get the associations 
IRelationship relationship = connector.Model as IRelationship; 

//Update the field assigned to the label. 
string labelFieldName = "ModifyLabelName"; 
relationship.SetField(labelFieldName, "SampleLabel"); 
} 
} 

:::note
You cannot assign new connector fields to labels from an extension.

:::