Vb code for validating textbox

20-Nov-2019 10:13

Set the Max Length property for each password field to 16, and your validation in terms of password length is then only required to check for a valid number of characters (since the maximum number cannot be exceeded in any case).The same is true for the user's date of birth (DOB) and the CAPTCHA sum (which as you will see, can never exceed two digits). The Visual Basic form has a powerful tool for creating multiple similar controls in a form. There is also a very useful Procedure to check the data that is input into a form to make sure that it conforms to the rules set down for the project. Before getting to the Validate procedure, just a few words on formatting the form.

We have therefore allowed the user the opportunity to enter a title that is not on the list, such as "Doctor" or "Professor", but have restricted the length of the input string to prevent abuse.Such measures involve the application of to any data being input to the program. input that does not obey the validation rules) can be dealt with in a pre-defined way, and will not cause the program to crash or produce spurious output.Data validation rules can also make an application more user friendly, since they enable the program to warn the user immediately when there is a problem rather than simply allowing them to continue entering data until the program crashes or some other problem occurs.) is of the correct type, and in the correct format.Although the programmer will obviously take every precaution to ensure the correct operation of the program, and will attempt to eliminate bugs that could cause a problem through a rigorous process of testing, they have no real control over mistakes made by the user during data entry.

We have therefore allowed the user the opportunity to enter a title that is not on the list, such as "Doctor" or "Professor", but have restricted the length of the input string to prevent abuse.Such measures involve the application of to any data being input to the program. input that does not obey the validation rules) can be dealt with in a pre-defined way, and will not cause the program to crash or produce spurious output.Data validation rules can also make an application more user friendly, since they enable the program to warn the user immediately when there is a problem rather than simply allowing them to continue entering data until the program crashes or some other problem occurs.) is of the correct type, and in the correct format.Although the programmer will obviously take every precaution to ensure the correct operation of the program, and will attempt to eliminate bugs that could cause a problem through a rigorous process of testing, they have no real control over mistakes made by the user during data entry.For the alignment, sizing and spacing of the controls, use the Format icon on the toolbar.