How do I let user enter valid time in a text box? in terms of 08:30AM 08:15AM 12:15PM. I am not looking for a solution for a single text box. There will be a datagrid of text boxes that user need to enter valid times in each of them. Begin time and end time of a particular event and begin time and end time for several types of events in that data grid. What is the best posiible alternatives.<BR><BR><BR>THANKS in advance