小编Zoy*_*hta的帖子

我收到这个错误:

Index and length must refer to a location within the string.
Parameter name: length

使用此代码:

string a1 = ddlweek.Text.Substring(0, 8);                
string a3 = ddlweek.Text.Substring(10, 14);

这是什么意思？