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DateTime time_Start , time_end;
int i1 = (int) Math.Ceiling(time_Start.Month / 3F);
string cmdtext1 = "select * from tb_" + i1;
int i2 = (int) Math.Ceiling(time_end.Month / 3F);
string cmdtext2 = "select * from tb_" + i2;
int i = (int) Math.Ceiling(DateTime.Now.Month / 3F);
string cmdtext = "select * from tb_" + i;
MessageBox.Show(cmdtext);