A easy function question

Ok, i know, i never remember HOW to place a function inside a button or similiar

How do i "call" this function inside a button?

Public Function finnOrdrenr() As Integer
 
        Dim forbindelse As New System.Data.OracleClient.OracleConnection
 
        forbindelse.ConnectionString = "user id=****;password=***;data source=*****"
        forbindelse.Open()
 
        Dim kommando As New System.Data.OracleClient.OracleCommand("select ordrner from", forbindelse)
 
        Dim dataleser As OracleClient.OracleDataReader
        dataleser = kommando.ExecuteReader()
        Dim onr As Integer
        While dataleser.Read()
            onr = dataleser.GetInt32(0)
        End While
 
        dataleser.Close()
        forbindelse.Close()
 
        Return onr
    End Function

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