Keypress Function inTextBox

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ASP.NET

I have a textbox with textchanged function but after that textchange function. It automatically trigger the button. How can I not trigger the button?

Is there any keypress function in textchange?

This is the textchange function

Protected Sub TextBox1_TextChanged(sender As Object, e As EventArgs) Handles txtPalleteNo.TextChanged
if txtPalleteNo.text = ""
ELSE
//DO CODE HERE

End If
        txtPalleteNo.Text = ""
        txtPalleteNo.Focus()

This is the Button that is being triggered after the textchange.

Protected Sub btnAccept_Click(sender As Object, e As EventArgs) Handles btnAccept.Click

       drpShipNo.Enabled = False
       btnShipment.Enabled = True
       btnAccept.Enabled = False
       txtPalleteNo.Enabled = False

end sub