Vb net combo box validating
If the reader has 0 rows (Has Rows = False), the data entered doesn't exist so you can continue on and allow the database to add that entry. Which means that a record already exists that matches what you are looking for. Text = rid(2) Msg Box("Section Already Exist", Msg Box Style. Selected Index = -1 Else ' do nothing End If End Sub 0 rows (Has Rows = True). Which means that a record already exists that matches what you are looking for.
The Rad Combo Box validation is activated only by those validators whose Validation Group property matches the Validation Group property of the Rad Combo Box.
By default, all validators on the web page must be successful before a postback can occur.
You can limit the controls that must be validated when the Rad Combo Box performs a post-back, while still allowing other controls on the web page to be validated, by using Validation Groups.
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.
Nor can they guarantee that any data files used by the program will be free of errors and in the correct format.
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There are however measures that can be taken to restrict the program's input to valid data.