VBA无限循环——当用户没有任何值的时候。

I'm a newbie to VBA and I'm writing a VBA code that will accept user inputs for the serial numbers for the Start and End value and will check if the serial numbers in another sheet fall between the range specified. If it does, then my code will pick the complete record and paste it into another sheet.I'm a newbie to VBA and I'm writing a VBA code