- #Vb net textbox validating event errorprovider how to#
- #Vb net textbox validating event errorprovider code#
- #Vb net textbox validating event errorprovider download#
Whenever you implement the IExtenderProvider interface, you need to override the CanExtend property. MaxValue: This is the maximum value for the range. MinValue: This is the minimum value for the range. RangeValueRequired: This tells the control to accept numbers in the supplied range. Required: This tells that control to accept only numbers. I am telling any control that looks in here (using reflection) that I am providing four properties: Public class NumberValidate : Component, IExtenderProvider (At least read up a little so you know what attributes are.) Here is the class definition. I suggest you read up on attributes before you go any further.
![vb net textbox validating event errorprovider vb net textbox validating event errorprovider](https://www.sourcecodester.com/sites/default/files/styles/medium/public/images/jaymeen_86/string_numeric.png)
I also use some for the properties within. I use some specialized attributes for these classes. Reading the first part of this chapter makes this part so much more understandable. The first part of this chapter covers regular expressions. The next thing to add is some namespace references to your code.Īs you can see, you will be using regular expressions again. You will notice that my solution has two projects. I start the next section by introducing you to my buddy Vlad the validator.įigure 8-13: A reference to the form's DLL This allows you to have 50 TextBoxes on the screen and use the extensions on only a few of them. The second class provides a regular expression property for validation before focus leaves the control.īy the way, both of these classes allow the TextBox to work as normal by using a Required property. The first class provides properties that make the control accept only numbers or only numbers within a certain range. This next example contains two classes that extend a TextBox control. It also allows you to turn any control on your form into … SuperControl!
#Vb net textbox validating event errorprovider code#
The code works the same (within limits) for any control. The ToolTip control does the same thing.Įxtending the properties of a control offers you a big advantage over making your own control. It is set up to extend the properties of any control on the current form. The ErrorProvider is a class that inherits from Component and also implements the IExtenderProvider interface. Your several controls now have a few extra properties related to the ErrorProvider.
![vb net textbox validating event errorprovider vb net textbox validating event errorprovider](https://i.stack.imgur.com/tZbX3.png)
Try a new project with several controls on it and look at the Properties page. In case you have not been paying attention, as soon as you put the ErrorProvider control on the form, every visible control on the form has several new properties that are related to the ErrorProvider control. Want a for-instance? How about the ToolTip control? I have not discussed this control in any detail, so how about the ErrorProvider control?Īs you know from previous chapters, the ErrorProvider control is something that you plop down on your form and it appears in the tray below the form. The neat thing about this extension is that it can work with any control you like. The other thing you can do is add a few new properties to a control without making a new one altogether. This is what you did in the last example. One of them is to make a completely new control by building on an existing control.
#Vb net textbox validating event errorprovider how to#
How to Get the X and Y Point of the TextBox Using For Each Loop in VB.Net Categories VB.Net Projects Tags error provider in vb.net, validation of a textbox in vb.You can do two things about making your own validation controls in.How to Create Rolling Numbers Game in VB.Net.What we have done here in this tutorial is that we learn how to write program code to perform the data validation using error provider control.
#Vb net textbox validating event errorprovider download#
You can download the complete source code of TextBox Validation using ErrorProvider Here.
![vb net textbox validating event errorprovider vb net textbox validating event errorprovider](https://i.stack.imgur.com/NnEYQ.png)
Step 4: Run your project and click the button to perform the code in the method. 'CHECKING IF YOU HAVE INPUT A STRING VALUE.ĮrrorProvider1.SetError(txt_integer, "You have input a string value that is not valid.")Ĥ. 'CHECKING IF YOU HAVE INPUT A NUMERIC VALUE.ĮrrorProvider1.SetError(txt_string, "You have input a numeric value that is not valid.") 'THE ERROR PROVIDER WILL APPEAR AND IT WILL INFORM THE PROBLEM TO THE USER.ĮrrorProvider1.SetError(txt_string, "Textbox must be filled up.")ĮrrorProvider1.SetError(txt_integer, "Textbox must be filled up.") If txt_string.Text = "" And txt_integer.Text = "" Then 'CHECKING IF THE TWO TEXTBOXES ARE CLEARED. Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click