Can System.EventArgs be cast to CommandEventArgs? If so, how?
Actually I want the Page_Load sub to invoke another sub which is the
OnCommand event handler of a LinkButton.
<script runat="server">
Sub Page_Load(obj As Object, ea As EventArgs)
CallCmd(obj, ??)
End Sub
Sub CallCmd(obj As Object, ea As CommandEventArgs)
..........
..........
End Sub
</script>
<form runat="server">
<asp:LinkButton ID="lnkButton" OnCommand="CallCmd" Text="ABCD"
runat="server"/>
</form>
For the Page_Load sub to invoke CallCmd, the second parameter should be
of type CommandEventArgs. How do I cast EventArgs to CommandEventArgs? 6  4702 
Call it like:
CallCmd(obj, CommandEventArgs.Empty)
<rn**@rediffmail.comwrote in message
news:11**********************@k70g2000cwa.googlegr oups.com...
Can System.EventArgs be cast to CommandEventArgs? If so, how?
Actually I want the Page_Load sub to invoke another sub which is the
OnCommand event handler of a LinkButton.
<script runat="server">
Sub Page_Load(obj As Object, ea As EventArgs)
CallCmd(obj, ??)
End Sub
Sub CallCmd(obj As Object, ea As CommandEventArgs)
..........
..........
End Sub
</script>
<form runat="server">
<asp:LinkButton ID="lnkButton" OnCommand="CallCmd" Text="ABCD"
runat="server"/>
</form>
For the Page_Load sub to invoke CallCmd, the second parameter should be
of type CommandEventArgs. How do I cast EventArgs to CommandEventArgs?
Joseph, I am getting the following error:
Unable to cast object of type 'System.EventArgs' to type
'System.Web.UI.WebControls.CommandEventArgs'.
pointing to the line
CallCmd(obj, CommandEventArgs.Empty)
Any other suggestions?
JosephByrns wrote:
Call it like:
CallCmd(obj, CommandEventArgs.Empty)
<rn**@rediffmail.comwrote in message
news:11**********************@k70g2000cwa.googlegr oups.com...
Can System.EventArgs be cast to CommandEventArgs? If so, how?
Actually I want the Page_Load sub to invoke another sub which is the
OnCommand event handler of a LinkButton.
<script runat="server">
Sub Page_Load(obj As Object, ea As EventArgs)
CallCmd(obj, ??)
End Sub
Sub CallCmd(obj As Object, ea As CommandEventArgs)
..........
..........
End Sub
</script>
<form runat="server">
<asp:LinkButton ID="lnkButton" OnCommand="CallCmd" Text="ABCD"
runat="server"/>
</form>
For the Page_Load sub to invoke CallCmd, the second parameter should be
of type CommandEventArgs. How do I cast EventArgs to CommandEventArgs?
Hmmm, I tried it got the same error, I have no idea why that happens, but if
you try:
CallCmd(obj, Nothing)
instead, then it will work.
<rn**@rediffmail.comwrote in message
news:11**********************@e3g2000cwe.googlegro ups.com...
Joseph, I am getting the following error:
Unable to cast object of type 'System.EventArgs' to type
'System.Web.UI.WebControls.CommandEventArgs'.
pointing to the line
CallCmd(obj, CommandEventArgs.Empty)
Any other suggestions?
JosephByrns wrote:
>Call it like:
CallCmd(obj, CommandEventArgs.Empty)
<rn**@rediffmail.comwrote in message
news:11**********************@k70g2000cwa.googleg roups.com...
Can System.EventArgs be cast to CommandEventArgs? If so, how?
Actually I want the Page_Load sub to invoke another sub which is the
OnCommand event handler of a LinkButton.
<script runat="server">
Sub Page_Load(obj As Object, ea As EventArgs)
CallCmd(obj, ??)
End Sub
Sub CallCmd(obj As Object, ea As CommandEventArgs)
..........
..........
End Sub
</script>
<form runat="server">
<asp:LinkButton ID="lnkButton" OnCommand="CallCmd" Text="ABCD"
runat="server"/>
</form>
For the Page_Load sub to invoke CallCmd, the second parameter should be
of type CommandEventArgs. How do I cast EventArgs to CommandEventArgs?
Yeah Joseph that works but the problem is I am using the
CommandArgument property of the LinkButton (sorry, I should have
mentioned this before)
<asp:LinkButton ID="lnkButton" OnCommand="CallCmd"
CommandArgument="Col1" Text="ABCD" runat="server"/>
The CallCmd sub looks like this:
Sub CallCmd(obj As Object, ea As CommandEventArgs)
txtCall.Text = ea.CommandArgument
..........
..........
End Sub
Now when I invoke CallCmd from Page_Load using
CallCmd(obj, Nothing)
then ASP.NET generates the following error:
Object reference not set to an instance of an object.
pointing to the first line shown above in the sub CallCmd!
Any other ideas??
JosephByrns wrote:
Hmmm, I tried it got the same error, I have no idea why that happens, but if
you try:
CallCmd(obj, Nothing)
instead, then it will work.
<rn**@rediffmail.comwrote in message
news:11**********************@e3g2000cwe.googlegro ups.com...
Joseph, I am getting the following error:
Unable to cast object of type 'System.EventArgs' to type
'System.Web.UI.WebControls.CommandEventArgs'.
pointing to the line
CallCmd(obj, CommandEventArgs.Empty)
Any other suggestions?
JosephByrns wrote:
Call it like:
CallCmd(obj, CommandEventArgs.Empty)
<rn**@rediffmail.comwrote in message
news:11**********************@k70g2000cwa.googlegr oups.com...
Can System.EventArgs be cast to CommandEventArgs? If so, how?
Actually I want the Page_Load sub to invoke another sub which is the
OnCommand event handler of a LinkButton.
<script runat="server">
Sub Page_Load(obj As Object, ea As EventArgs)
CallCmd(obj, ??)
End Sub
Sub CallCmd(obj As Object, ea As CommandEventArgs)
..........
..........
End Sub
</script>
<form runat="server">
<asp:LinkButton ID="lnkButton" OnCommand="CallCmd" Text="ABCD"
runat="server"/>
</form>
For the Page_Load sub to invoke CallCmd, the second parameter should be
of type CommandEventArgs. How do I cast EventArgs to CommandEventArgs?
You could either check to see if it is nothing before you use ea or you
could call it like:
CallCmd(Me, New CommandEventArgs("Command From Load", "LoadArgument1"))
<rn**@rediffmail.comwrote in message
news:11**********************@k70g2000cwa.googlegr oups.com...
Yeah Joseph that works but the problem is I am using the
CommandArgument property of the LinkButton (sorry, I should have
mentioned this before)
<asp:LinkButton ID="lnkButton" OnCommand="CallCmd"
CommandArgument="Col1" Text="ABCD" runat="server"/>
The CallCmd sub looks like this:
Sub CallCmd(obj As Object, ea As CommandEventArgs)
txtCall.Text = ea.CommandArgument
..........
..........
End Sub
Now when I invoke CallCmd from Page_Load using
CallCmd(obj, Nothing)
then ASP.NET generates the following error:
Object reference not set to an instance of an object.
pointing to the first line shown above in the sub CallCmd!
Any other ideas??
JosephByrns wrote:
>Hmmm, I tried it got the same error, I have no idea why that happens, but
if
you try:
CallCmd(obj, Nothing)
instead, then it will work.
<rn**@rediffmail.comwrote in message
news:11**********************@e3g2000cwe.googlegr oups.com...
Joseph, I am getting the following error:
Unable to cast object of type 'System.EventArgs' to type
'System.Web.UI.WebControls.CommandEventArgs'.
pointing to the line
CallCmd(obj, CommandEventArgs.Empty)
Any other suggestions?
JosephByrns wrote:
Call it like:
CallCmd(obj, CommandEventArgs.Empty)
<rn**@rediffmail.comwrote in message
news:11**********************@k70g2000cwa.googleg roups.com...
Can System.EventArgs be cast to CommandEventArgs? If so, how?
Actually I want the Page_Load sub to invoke another sub which is the
OnCommand event handler of a LinkButton.
<script runat="server">
Sub Page_Load(obj As Object, ea As EventArgs)
CallCmd(obj, ??)
End Sub
Sub CallCmd(obj As Object, ea As CommandEventArgs)
..........
..........
End Sub
</script>
<form runat="server">
<asp:LinkButton ID="lnkButton" OnCommand="CallCmd" Text="ABCD"
runat="server"/>
</form>
For the Page_Load sub to invoke CallCmd, the second parameter should
be
of type CommandEventArgs. How do I cast EventArgs to
CommandEventArgs?
Better yet, refactor your event handler to pass its work on to another
method
Sub CallCmd(sender as Object, e as CommandEventArgs)
DoSomethingWithCmd(e.CommandArgument)
End Sub
Sub DoSomethingWithCmd(argument as string)
...
End Sub
Sub Page_Load(sender as object, e as EventArgs)
...
DoSomethingWithCmd(somePredefinedString)
...
End Sub
Generally, you'll find your life easier if Event Handlers do _nothing_
but handle an event. The actual work should be done in a different
method for precisely this reason.
Joseph Byrns wrote:
You could either check to see if it is nothing before you use ea or you
could call it like:
CallCmd(Me, New CommandEventArgs("Command From Load", "LoadArgument1"))
<rn**@rediffmail.comwrote in message
news:11**********************@k70g2000cwa.googlegr oups.com...
Yeah Joseph that works but the problem is I am using the
CommandArgument property of the LinkButton (sorry, I should have
mentioned this before)
<asp:LinkButton ID="lnkButton" OnCommand="CallCmd"
CommandArgument="Col1" Text="ABCD" runat="server"/>
The CallCmd sub looks like this:
Sub CallCmd(obj As Object, ea As CommandEventArgs)
txtCall.Text = ea.CommandArgument
..........
..........
End Sub
Now when I invoke CallCmd from Page_Load using
CallCmd(obj, Nothing)
then ASP.NET generates the following error:
Object reference not set to an instance of an object.
pointing to the first line shown above in the sub CallCmd!
Any other ideas??
JosephByrns wrote:
Hmmm, I tried it got the same error, I have no idea why that happens, but
if
you try:
CallCmd(obj, Nothing)
instead, then it will work.
<rn**@rediffmail.comwrote in message
news:11**********************@e3g2000cwe.googlegro ups.com...
Joseph, I am getting the following error:
Unable to cast object of type 'System.EventArgs' to type
'System.Web.UI.WebControls.CommandEventArgs'.
pointing to the line
CallCmd(obj, CommandEventArgs.Empty)
Any other suggestions?
JosephByrns wrote:
Call it like:
CallCmd(obj, CommandEventArgs.Empty)
<rn**@rediffmail.comwrote in message
news:11**********************@k70g2000cwa.googlegr oups.com...
Can System.EventArgs be cast to CommandEventArgs? If so, how?
Actually I want the Page_Load sub to invoke another sub which is the
OnCommand event handler of a LinkButton.
<script runat="server">
Sub Page_Load(obj As Object, ea As EventArgs)
CallCmd(obj, ??)
End Sub
Sub CallCmd(obj As Object, ea As CommandEventArgs)
..........
..........
End Sub
</script>
<form runat="server">
<asp:LinkButton ID="lnkButton" OnCommand="CallCmd" Text="ABCD"
runat="server"/>
</form>
For the Page_Load sub to invoke CallCmd, the second parameter should
be
of type CommandEventArgs. How do I cast EventArgs to
CommandEventArgs?
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