How to Stop Process if the data validation result is wrong using class?

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Hi,

i want to make data validation using class. when i am doing this process i couldn't able to make( "Exit Sub" or stop the action) if the data validation result is wrong. please advice me how can i do the process?where i can do the process? if possible, send me the source code.

see the code in the form and its related class

class

VB.NET

Public class datavalidation
Public Function dtavalidation_WHmstr(ByVal pWarehouseID As TextBox, ByVal pName As TextBox) As TextBox
        Try

            If pWarehouseID.Text = "" Or Not IsNumeric(pWarehouseID) Then
                MsgBox("You have not entered the WareHouse ID? This is a mandatory field", MsgBoxStyle.Critical, "Data Validation")
                pWarehouseID.Focus()
            ElseIf pName.Text = "" Then
                MsgBox("You have not entered the WareHouse Name? This is a mandatory field", MsgBoxStyle.Critical, "Data Validation")
                pName.Focus()
            End If
        Catch ex As Exception

        Finally

        End Try
    End Function
  
End Class

This is the form source code

VB

 Private Sub cmdSave_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmdSave.Click
       
        Dim dtvld As New DataValidation
        dtvld.dtavalidation_WHmstr(TxtWHID, TxtWHName)
end sub

Posted 24-Jan-12 1:42am

Refeesh

Updated 24-Jan-12 1:52am

CPallini

v2

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CPallini 24-Jan-12 7:54am

What exactly do you need? Could you please state your requirements more clearly?
(at a glance, I guess you may simply throw an exception).

Jαved 24-Jan-12 8:48am

You are not returning any value then why are you using Functions?

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Clark Kent123 · Answer 1 · 2012-01-24T02:20:00

Since you called your class "datavalidation" it's rather hard with the information you have provided what function element needs to do what sort of validation. All that you have provided is a function that returns a TextBox with which you don't even use in your example.

Why not try something along these lines. I am not saying that this is the answer, but rather more food for thought.

VB

Public class datavalidation
Public Function Validate_Fields(ByRef pWarehouseID As TextBox, ByRef pName As TextBox) as BOOLEAN

If pWarehouseID.Text = "" Or Not IsNumeric(pWarehouseID) Then

pWarehouseID.Text = "You have not entered the WareHouse ID? This is a mandatory field."  
pWarehouseID.Focus()
pWarehouseID.Backcolor= Color.Red
return False
            
ElseIf pName.Text = "" Then

pName.Text="You have not entered the WareHouse Name? This is a mandatory field"
pName.Focus()
pName.Backcolor = Color.Red
return False

Else
'Success
return True

End If

End Function

Let me know if this the direction you want to go in. By the way in your pWarehouse_TextChanged reset the backcolor to the default color. Same thing with the pName_Textchanged.

This is not the only way on how to validate your fields. Be creative and have fun with it. :)

Edit: After submitting this answer I did a quick search here on CP and found this article. This might help you out. Keep on coding! :)

Validators for Windows Forms - ValidationProvider Control[^]

manognya kota · Answer 2 · 2012-01-24T02:05:00

Hi,

why cant we embed the custom validator to the control itself.
Like if the user goes to another control without filling the first, you can have a tooltip saying this field is manditory or any custom validator.

check this link for validators.

http://www.w3schools.com/aspnet/aspnet_refvalidationcontrols.asp[^]

Hope this helps.

How to Stop Process if the data validation result is wrong using class?

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