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Below is some template code which loads the foreign keys of a table into a Dictionary object. It stores the name of the table and foreign key field name. As you can see, it generates a notice when it comes across a recursive relationship.

public Dictionary<string,string> GetForeignKeyTables()
{
    Dictionary<string,string> dic = new Dictionary<string,string>( );

 for (int idx = 0; idx < SourceTable.ForeignKeys.Count; idx ++)
 {
        string primaryTable = String.Empty;
        string primaryKey = String.Empty;

  // To get the foreign key columns
  ColumnSchema col1 = SourceTable.ForeignKeys[idx].ForeignKeyMemberColumns[0];
        primaryKey = col1.Name.Trim();

  // To get the foreign key tables
        primaryTable = SourceTable.ForeignKeys[idx].PrimaryKeyTable.ToString().Replace("dbo.",String.Empty).Trim();
        if (!dic.ContainsKey(primaryKey))
            dic.Add(primaryKey, primaryTable);
        else
            MessageBox.Show("This table may contain recursive relationships. You must set those relationships up manually.");
    }

    return dic;
}