public int DelEdge(string name1, string name2)
{
int delLength = 0;
if (list.Contains(name1) && list.Contains(name2))
{
Vertex first = list.GetVertex(name1);
Vertex second = list.GetVertex(name2);
if (list[first, second] != null)
{
delLength = list[first, second].Length;
list.DelLink(first, second);
return(delLength);
}
else
{
throw new EdgeDoesNotExistException();
}
}
else
{
throw new VertexDoesNotExistException();
}
}