超时时间已到。在操作完成之前超时时间已过或服务器未响应

服务器超时.
WEB.CONFIG 手工添加httpRuntime，如
<system.web>
<httpRuntime maxRequestLength="1000000" executionTimeout="2000" />
</system.web>
连接字符串里timeout设置下

command的timeout

DateTime FiveBeforeDay = DateTime.Now.AddDays(-KeepDays);

SqlParameter[] parameters = {
new SqlParameter("@Time",FiveBeforeDay)
};
SqlConnection connection = new SqlConnection(Conn);
connection.Open();
SqlCommand cmd = new SqlCommand(ClearDB_lyncplusSQL,connection);
cmd.CommandTimeout = 600000;
cmd.Parameters.AddRange(parameters);
int res = cmd.ExecuteNonQuery();