Errorprovider validating

In the "txt_name Validating()" event, if txt_name is left empty then it shows error. The set Error method sets the error description string for the specified control.If the user hovers the mouse over the error icon then it shows an error description string that we have declared in the set Error() method.Another efficient use of the user control is to simply preload a Combo Box or List Box with static items you commonly use in almost every application; some examples of this are countries/regions, cities, states, and office locations.For more information about authoring custom controls, see Developing Custom Windows Forms Controls with the . You might consider creating a namespace that contains several classes of user controls and compiling it into one DLL.I did find this thing here Counting Error Provider but incase someone knows a better way... Ok so basically I have a Win Form which has many Text Boxes Now when user enters values I use Validating to perform validation and if it does not match Regex I set the Error Provider ON for that Control..similarly if the user changes the value to a acceptable one I switch Error Provider OFF for that Control..

This gives you the ability to reference the user control in many applications and save time laying out and coding the contained elements of the user control.Optionally, invalidates the child controls assigned to the control.(Inherited from Control.)Invalidates the specified region of the control (adds it to the control's update region, which is the area that will be repainted at the next paint operation), and causes a paint message to be sent to the control.(Inherited from Control.)Invalidates the specified region of the control (adds it to the control's update region, which is the area that will be repainted at the next paint operation), and causes a paint message to be sent to the control.Optionally, invalidates the child controls assigned to the control.(Inherited from Control.) This API supports the product infrastructure and is not intended to be used directly from your code.A user control also gives you consistency within or across applications; for example, all address information input blocks will all have the same appearance and behavior.Consistency gives your application a more polished and professional appearance.

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