does not have the same signature as delegate 'Delegate Sub

I dont really understand the error, what is a signature?

I call this in the OnItemInserted="senduser"

below is the error

Compiler Error Message: BC30408: Method 'Protected Sub senduser(sender As Object, e As System.Web.UI.WebControls.SqlDataSourceCommandEventArgs)' does not have the same signature as delegate 'Delegate Sub FormViewInsertedEventHandler(sender As Object, e As System.Web.UI.WebControls.FormViewInsertedEventArgs)'.

Source Error:

 

Line 17:             <tr>
Line 18:                 <td>
Line 19:                     <asp:FormView ID="FormView1" runat="server" DataKeyNames="ID"
Line 20:                         DataSourceID="SqlDataSource1" OnItemInserted="senduser">
Line 21:                    
 

Protected Sub senduser(ByVal sender As Object, ByVal e As SqlDataSourceCommandEventArgs)
        e.Command.Parameters("@Openedby").Value = User.Identity.Name
    End Sub

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