VB.NET What is Sender used for?

Question

I\'m confused as to the purpose of the sender parameter in Winform controls, for example:

Private Sub Form1_Load(sender As System.Object, e As S         


        

Answer 1

e refers to the event arguments for the used event, they usually come in the form of properties/functions/methods that get to be available on it.

In this example the label text property will contain the BorderColor set for the footer style of our GridView when its FooterRow, determined from the row sent as a property on the event arguments parameter, binds the data with the GridView DataSource.

Private Sub GridView1_RowDataBound(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewRowEventArgs) Handles GridView1.RowDataBound
        If e.Row.RowType = DataControlRowType.Footer Then
            lblFooterColor.Text = e.Row.Style("BorderColor")
        End If
End Sub