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How do I dynamically validate text using the TextChanged event in the EditControl?

Platform: WinForms |
Control: EditControl |
Published Date: April 30, 2011 |
Last Revised Date: July 10, 2014

 

This can be easily accomplished using the TextChanged event and a timer.

The validation routine is invoked in response to a brief pause in typing by the user.

Refer to the code snippets and the sample attached to know more about it.

C#

private void editControl1_TextChanged(object sender, System.EventArgs e)

{

// Do not start the timer as long as characters are being typed.

if (this.timer1.Enabled == true)

this.timer1.Stop();

this.timer1.Start();

}

private void timer1_Tick(object sender, System.EventArgs e)

{

this.ValidateText();

this.timer1.Stop();

}

private void ValidateText()

{

// Perform your validation logic here.

Console.WriteLine("Text validated");

}

VB

Private Sub editControl1_TextChanged(sender As Object, e As System.EventArgs) Handles

editControl1.TextChanged

' Do not start the timer as long as characters are being typed.

If Me.timer1.Enabled = True Then

Me.timer1.Stop()

End If

Me.timer1.Start()

End Sub 'editControl1_TextChanged

Private Sub timer1_Tick(sender As Object, e As System.EventArgs) Handles timer1.Tick

Me.ValidateText()

Me.timer1.Stop()

End Sub 'timer1_Tick

Private Sub ValidateText()

' Perform your validation logic here.

MessageBox.Show("Text validated")

End Sub 'ValidateText

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