学习.net遇到关于对像的问题.
void Grid_CartCommand(Object sender, DataGridCommandEventArgs e) {
........................
if (((LinkButton)e.CommandSource).CommandName == "AddToCart") {
.....................
1.为什么用DataGridCommandEventArgs而不用EventArgs?
2.还有这一块 (LinkButton)e.CommandSource 是什么意思.