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user control interaction Messages   Related Types This message was discovered on ASPFriends.com 'aspngfreeforall' list. Ahmed, Salman Here is my setup: index.aspx has 2 user controls on the page. UserControl#1 Has a dropdownlist UserControl#2 Is suppose to visible only when the user selects a value from the dropdownlist(uc#1) and clicks the button. How can I check for a value or post back from user control one for the dropdownlist? Reply to this message...        Matt Serdar in UC1 'create a publicly accessible event for other pages to see, this event will be raised when the combo is changed Public Event UC1_Combo_Changed(ByVal sender As Object, ByVal e As System.EventArgs) 'this is the event for your combo box Private Sub Uc1_Combo_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles Uc1_Combo_.SelectedIndexChanged RaiseEvent UC1_Combo_Changed(sender, e) End Sub 'now in your 'parent' page that has the 2 user controls 'you'll have your usercontrol protected event Protected WithEvents myUC1 As UC1 'if you select from the 2 combo boxes at the top of your IDE's code behind window you'll find that UC1_Combo_Changed or whatever you named your public event will appear in the left combo box and then in the 'Declarations' combo on the right you'll find the public event UC1_Combo_Changed. If you select these .NET will automatically stub out your private sub to roughly resemble this Private Sub UC1_Combo_Changed(ByVal sender As Object, ByVal e As UC1) Handles Uc1_Combo_.SelectedIndexChanged End Sub hth matt -----Original Message----- From: Ahmed, Salman [mailto:Click here to reveal e-mail address] Sent: Tuesday, August 06, 2002 6:33 AM To: aspngfreeforall Subject: [aspngfreeforall] user control interaction Here is my setup: index.aspx has 2 user controls on the page. UserControl#1 Has a dropdownlist UserControl#2 Is suppose to visible only when the user selects a value from the dropdownlist(uc#1) and clicks the button. How can I check for a value or post back from user control one for the dropdownlist? | ASP.net DOCS = http://www.aspng.com/docs | [aspngfreeforall] member Click here to reveal e-mail address = YOUR ID | http://www.asplists.com/aspngfreeforall JOIN/QUIT | news://ls.asplists.com = NEWSGROUP Reply to this message...        Moores, Ian As far as i am aware there is no way to automatically transfer data from one usercontrol to another... if there is then i please let me know as well .. i am doing it using out-of-process session variables.... Ian Moores Web Developer / WebMaster iRevolution Ltd +44 (0)1895 425 789 Direct +44 (0)1895 444 420 Tel +44 (0)1895 444 460 Fax     -----Original Message-----     From: Ahmed, Salman [mailto:Click here to reveal e-mail address]     Sent: 06 August 2002 14:33     To: aspngfreeforall     Subject: [aspngfreeforall] user control interaction     Here is my setup:          index.aspx has 2 user controls on the page.          UserControl#1     Has a dropdownlist          UserControl#2     Is suppose to visible only when the user selects a value from the dropdownlist(uc#1) and clicks the button.               How can I check for a value or post back from user control one for the dropdownlist?     | ASP.net DOCS = http://www.aspng.com/docs | [aspngfreeforall] member Click here to reveal e-mail address = YOUR ID | http://www.asplists.com/aspngfreeforall = JOIN/QUIT | news://ls.asplists.com = NEWSGROUP Reply to this message...        Ahmed, Salman One method would be to add the selected item in the httpcontext.items and then access it from the other user control. Just wanted to get other peoples thoughts on the topic, there doesn't seem to a 'industry' standard way of doing this even though I would suspect it is a comment problem. -----Original Message----- From: Moores, Ian [mailto:Click here to reveal e-mail address] Sent: Tuesday, August 06, 2002 11:18 AM To: aspngfreeforall Subject: [aspngfreeforall] RE: user control interaction As far as i am aware there is no way to automatically transfer data from one usercontrol to another... if there is then i please let me know as well .. i am doing it using out-of-process session variables.... Ian Moores Web Developer / WebMaster iRevolution Ltd +44 (0)1895 425 789 Direct +44 (0)1895 444 420 Tel +44 (0)1895 444 460 Fax -----Original Message----- From: Ahmed, Salman [mailto:Click here to reveal e-mail address] Sent: 06 August 2002 14:33 To: aspngfreeforall Subject: [aspngfreeforall] user control interaction Here is my setup: index.aspx has 2 user controls on the page. UserControl#1 Has a dropdownlist UserControl#2 Is suppose to visible only when the user selects a value from the dropdownlist(uc#1) and clicks the button. How can I check for a value or post back from user control one for the dropdownlist? | ASP.net DOCS = http://www.aspng.com/docs | [aspngfreeforall] member Click here to reveal e-mail address = YOUR ID | http://www.asplists.com/aspngfreeforall = JOIN/QUIT | news://ls.asplists.com = NEWSGROUP | ASP.net DOCS = http://www.aspng.com/docs | [aspngfreeforall] member Click here to reveal e-mail address = YOUR ID | http://www.asplists.com/aspngfreeforall = JOIN/QUIT | news://ls.asplists.com = NEWSGROUP Reply to this message...        Feduke Cntr Charles R You could mark your controls as serializable and then have a method or constructor in another control that consumes the serial stream of another user control to share data between the controls. Of course I don't think the above has anything to do with the question that was asked. You probably want to take a look at the OnSelectIndexChanged event (make sure ViewState for the DropDownList is enabled for this event to fire!) with AutoPostBack = true (when AutoPostBack is set to true on a DropDownList, the page will automatically post back to the server when the DropDownList's contents are changed). Then in your SelectIndexChanged event you'd just userControl2.Visible = true;. This doesn't do anything for client-side script, but to do that just... <asp:DropDownList onClick="document.<%= userControl2.UniqueID %>.style.visible = 'visible';" /> <!-- might have to check on that JavaScript above, its from memory --> assuming userControl2 is the Id of your second user control and its also defined as a variable in your code behind file. HTH, - Chuck -----Original Message----- From: Moores, Ian [mailto:Click here to reveal e-mail address] Sent: Tuesday, August 06, 2002 11:18 AM To: aspngfreeforall Subject: [aspngfreeforall] RE: user control interaction As far as i am aware there is no way to automatically transfer data from one usercontrol to another... if there is then i please let me know as well .. i am doing it using out-of-process session variables.... Ian Moores Web Developer / WebMaster iRevolution Ltd +44 (0)1895 425 789 Direct +44 (0)1895 444 420 Tel +44 (0)1895 444 460 Fax -----Original Message----- From: Ahmed, Salman [mailto:Click here to reveal e-mail address] Sent: 06 August 2002 14:33 To: aspngfreeforall Subject: [aspngfreeforall] user control interaction Here is my setup: index.aspx has 2 user controls on the page. UserControl#1 Has a dropdownlist UserControl#2 Is suppose to visible only when the user selects a value from the dropdownlist(uc#1) and clicks the button. How can I check for a value or post back from user control one for the dropdownlist? | ASP.net DOCS = http://www.aspng.com/docs | [aspngfreeforall] member Click here to reveal e-mail address = YOUR ID | http://www.asplists.com/aspngfreeforall = JOIN/QUIT | news://ls.asplists.com = NEWSGROUP | ASP.net DOCS = http://www.aspng.com/docs | [aspngfreeforall] member Click here to reveal e-mail address = YOUR ID | http://www.asplists.com/aspngfreeforall JOIN/QUIT | news://ls.asplists.com = NEWSGROUP Reply to this message...        Ahmed, Salman I have a button that has a onclick event that checks for the value selected in the listbox..do I have to reload the listbox with the values from the database before doing this check? I keep getting System.NullReferenceException: Object reference not set to an instance of an object.?? My Code: public void btnEditUser_Click(object sender, EventArgs e) { Response.Write (lbUsers.SelectedItem.Value); } -----Original Message----- From: Ahmed, Salman [mailto:Click here to reveal e-mail address] Sent: Tuesday, August 06, 2002 12:46 PM To: aspngfreeforall Subject: [aspngfreeforall] RE: user control interaction One method would be to add the selected item in the httpcontext.items and then access it from the other user control. Just wanted to get other peoples thoughts on the topic, there doesn't seem to a 'industry' standard way of doing this even though I would suspect it is a comment problem. -----Original Message----- From: Moores, Ian [mailto:Click here to reveal e-mail address] Sent: Tuesday, August 06, 2002 11:18 AM To: aspngfreeforall Subject: [aspngfreeforall] RE: user control interaction As far as i am aware there is no way to automatically transfer data from one usercontrol to another... if there is then i please let me know as well .. i am doing it using out-of-process session variables.... Ian Moores Web Developer / WebMaster iRevolution Ltd +44 (0)1895 425 789 Direct +44 (0)1895 444 420 Tel +44 (0)1895 444 460 Fax -----Original Message----- From: Ahmed, Salman [mailto:Click here to reveal e-mail address] Sent: 06 August 2002 14:33 To: aspngfreeforall Subject: [aspngfreeforall] user control interaction Here is my setup: index.aspx has 2 user controls on the page. UserControl#1 Has a dropdownlist UserControl#2 Is suppose to visible only when the user selects a value from the dropdownlist(uc#1) and clicks the button. How can I check for a value or post back from user control one for the dropdownlist? | ASP.net DOCS = http://www.aspng.com/docs | [aspngfreeforall] member Click here to reveal e-mail address = YOUR ID | http://www.asplists.com/aspngfreeforall = JOIN/QUIT | news://ls.asplists.com = NEWSGROUP | ASP.net DOCS = http://www.aspng.com/docs | [aspngfreeforall] member Click here to reveal e-mail address = YOUR ID | http://www.asplists.com/aspngfreeforall = JOIN/QUIT | news://ls.asplists.com = NEWSGROUP | ASP.net DOCS = http://www.aspng.com/docs | [aspngfreeforall] member Click here to reveal e-mail address = YOUR ID | http://www.asplists.com/aspngfreeforall = JOIN/QUIT | news://ls.asplists.com = NEWSGROUP Reply to this message...        Thomas Fuller Need to see more code to be sure. Is this code fired off on the postback? Is there n item actually chosen. I'm working on something that uses these list box values right now and your syntax looks fine below. I think the problem is somewhere other than here. Tom -----Original Message----- From: Ahmed, Salman [mailto:Click here to reveal e-mail address] Sent: Tuesday, August 06, 2002 1:40 PM To: aspngfreeforall Subject: [aspngfreeforall] RE: user control interaction I have a button that has a onclick event that checks for the value selected in the listbox..do I have to reload the listbox with the values from the database before doing this check? I keep getting System.NullReferenceException: Object reference not set to an instance of an object.?? My Code: public void btnEditUser_Click(object sender, EventArgs e) { Response.Write (lbUsers.SelectedItem.Value); } -----Original Message----- From: Ahmed, Salman [mailto:Click here to reveal e-mail address] Sent: Tuesday, August 06, 2002 12:46 PM To: aspngfreeforall Subject: [aspngfreeforall] RE: user control interaction One method would be to add the selected item in the httpcontext.items and then access it from the other user control. Just wanted to get other peoples thoughts on the topic, there doesn't seem to a 'industry' standard way of doing this even though I would suspect it is a comment problem. -----Original Message----- From: Moores, Ian [mailto:Click here to reveal e-mail address] Sent: Tuesday, August 06, 2002 11:18 AM To: aspngfreeforall Subject: [aspngfreeforall] RE: user control interaction As far as i am aware there is no way to automatically transfer data from one usercontrol to another... if there is then i please let me know as well .. i am doing it using out-of-process session variables.... Ian Moores Web Developer / WebMaster iRevolution Ltd +44 (0)1895 425 789 Direct +44 (0)1895 444 420 Tel +44 (0)1895 444 460 Fax -----Original Message----- From: Ahmed, Salman [mailto:Click here to reveal e-mail address] Sent: 06 August 2002 14:33 To: aspngfreeforall Subject: [aspngfreeforall] user control interaction Here is my setup: index.aspx has 2 user controls on the page. UserControl#1 Has a dropdownlist UserControl#2 Is suppose to visible only when the user selects a value from the dropdownlist(uc#1) and clicks the button. How can I check for a value or post back from user control one for the dropdownlist? | ASP.net DOCS = http://www.aspng.com/docs | [aspngfreeforall] member Click here to reveal e-mail address = YOUR ID | http://www.asplists.com/aspngfreeforall = JOIN/QUIT | news://ls.asplists.com = NEWSGROUP | ASP.net DOCS = http://www.aspng.com/docs | [aspngfreeforall] member Click here to reveal e-mail address = YOUR ID | http://www.asplists.com/aspngfreeforall = JOIN/QUIT | news://ls.asplists.com = NEWSGROUP | ASP.net DOCS = http://www.aspng.com/docs | [aspngfreeforall] member Click here to reveal e-mail address = YOUR ID | http://www.asplists.com/aspngfreeforall = JOIN/QUIT | news://ls.asplists.com = NEWSGROUP | ASP.net DOCS = http://www.aspng.com/docs | [aspngfreeforall] member Click here to reveal e-mail address = YOUR ID | http://www.asplists.com/aspngfreeforall JOIN/QUIT | news://ls.asplists.com = NEWSGROUP Reply to this message...     System.EventArgs System.NullReferenceException System.Web.UI.UserControl System.Web.UI.WebControls.DropDownList System.Windows.Forms.UserControl Ad MBR BootFX Best-of-breed application framework for .NET projects, developed by Matthew Baxter-Reynolds and MBR IT

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