字符串操作将字符串截断到C#上的指定表达式

Question

如何从每行中删除三个以上的空格并在那里结束字符串以使用c#查看右侧的行？

[Example1]  
PO BOX XXX                                       OVERDUE - PAY NOW  
then transform to  
PO BOX XXX

[Example2]  
ClientB                                AMOUNT CARRI  
then transform to  
ClientB  

[Example3]  
PO BOX 400                                                    FORWARD TO N  
then transform to  
PO BOX 400  

Answer 1

var firstColumn = origString.SubString(0, origString.IndexOf("   "));