我怀疑User是Access中的保留字-因此您不能按原样使用它，需要将它括起来方括号

I suspect that User is a reserved word in Access - so you can''t use it as is, you need to surround it with square brackets

string insertCMD = "INSERT INTO LoginTable ([User],Pass) VALUES (@User,@Pass)";

可能会做到

will probably do it