MasktextBox get cleared when loosing focus

Question

I have masktextbox to enter a date for user registration date. But when I press tab or give focus to any other control in my form then that date get vanishes or say invisible. So that my sql server database get null value after inserting data into database table. What is the issue? Plz Help.Thanks in advance

Nilesh Avhad · Answer

I attached zip file. Also attached image of my form. Problem is that when I enter a date in Reg Date's masktextbox and press tab then entered date get vanished. Also when I press add button of bindiding navigatotor then previous row of grid get cleared and can not see the record. As shown in image I pressed add button of bindinding navigator you can see that first row of grid only shows select word in one coloumn and other are get cleared. What is the problem? Please help. Thanks in advanace

Satyapriya Nayak · Answer

Please send your code