字符串，那位朋友解释一下
xxx= "scrollamount= ' " + txt1.Text + " ' ";
正确
string UserDirectory = "TestFileId "

FileUploadImage.SaveAs(System.Web.HttpContext.Current.Request.MapPath( UserDirectory + "/Images/ ") + FileUploadImage.FileName);

如何让UserDirectory + "/Images/ " 连起来 解释一下asp.net 的字符串
+ STR +
' " + STR + " '
" '+ str + ' "
等，为什么这样
以前曾想明白过，几年不编程了，忘了
谢谢

[解决办法]
不明白你想问什么?
[解决办法]
string a= "1 ";
string b= "2 ";
string c=a+b;
string d= "1 "+b;
[解决办法]
+ STR +
//比如str1= "sdf " + STR + "sdkj ";
' " + STR + " '
//比如strsql = "update usersheet set username= ' " + STR + " ',userpass= ' " + Pass + " ' ";

" '+ str + ' "
//这个似乎没有