摘要:
//请编程遍历页面上所有textbox控件并给它赋值为string.emptyforeach (control ontrol in this.controls){if(boxcontrol is text){textbox tb = (textbox)conrol;tb.text=string.empty}}//空值函数nvl(expr1,expr2)nvl2(expr1,expr2,expr3)nullif(expr1,expr2) 比较1和2的值 相等返回null 不相等返回expr1的值//replace 函数 替换string [] sql ={"1234","2345","2356" 阅读全文