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For an Error Provider component to display data errors on a form, it does not have to be directly associated with a control.Once it is bound to a data source, it can display an error icon next to any control that is bound to the same data source. You can use Regular Expression to validate a Textbox to enter number only. Forms; namespace Windows Forms Application1 Public Class Form1 Private Sub Text Box1_Key Press(By Val sender As Object, By Val e As System. Note If you change the error provider's Data Source and Data Member properties at run time, you should use the Bind To Data And Errors method to avoid conflicts. We're a friendly computing community, bustling with knowledgeable members to help solve your tech questions.

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The Error Provider component's key properties are Data Source, Container Control, and Icon.for example we enter in the name texbox the name "John Smith" === What do you consider valid text? If you limit it to only letters and blanks then names like Ryan O'Neal and Joseph Gordon-Levitt would both be invalid. Text End Sub Private Sub Timer1_Tick(By Val sender As System. Why not just allow any characters, then parse on a blank. If the two names don't match anything in the database then disallow. The requirements that I have to use a text box and @Palash Bansal96 this is not the correct way to do it.. It works correct but what if there is a change happened and you have to add a character to a name? so that won't work, @Reverend Jim you are correct, what if the name had many spaces and characters? You could simplify the rules and post them on the form(eg. Start() End Sub Private Sub Text Box1_Text Changed(By Val sender As System. The Windows Forms Error Provider component is used to validate user input on a form or control.