Mike Eghtebas
asked on
Object reference not set... asp 4
The list box in question is:
lstEducation.SelectedItem. Text = Session("education")
The intelesens shows a valid choice for the session variable.
-------------------
<asp:ListBox ID="lstEducation" runat="server" Width="205px">
<asp:ListItem >High School</asp:ListItem>
<asp:ListItem>Associate's Degree</asp:ListItem>
<asp:ListItem>Four-Year College</asp:ListItem>
<asp:ListItem>Masters</asp:ListItem>
<asp:ListItem>PhD</asp:ListItem>
</asp:ListBox>
This error occurs in page load at:lstEducation.SelectedItem.
The intelesens shows a valid choice for the session variable.
-------------------
Object reference not set to an instance of an object.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.
Source Error:
Line 62: ddlMaterialStatus.SelectedItem.Text = Session("maritalStatus")
Line 63:
Line 64: lstEducation.SelectedItem.Text = Session("education")
Line 65: chkAddComment.Checked = Session("addComment")
Line 66: txtComment.Text = Session("comment")
Stack Trace:
[NullReferenceException: Object reference not set to an instance of an object.]
addContact.Page_Load(Object sender, EventArgs e) in ... AddContact.aspx.vb:64
System.Web.UI.Control.OnLoad(EventArgs e) +91
System.Web.UI.Control.LoadRecursive() +74
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +2207
Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.272
ASKER
I was trying to do validation in client side. OnLoad will require postback.
Well, it hits on Page_Load, so this doesn't seem to be in client side.
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ASKER
Hi CodeCruiser,
This sort of masks the problem there is in my solution. After returning from Confirm page AddNew page. In the load event of AddNew page I have:
lstEducation.SelectedItem. Text = Session("education")
The session variable has some value in it but it doesn't deliver to lstEducation control.
Why lstEducation.SelectedItem. Text = Session("education") is not working?
Thank you
This sort of masks the problem there is in my solution. After returning from Confirm page AddNew page. In the load event of AddNew page I have:
lstEducation.SelectedItem.
The session variable has some value in it but it doesn't deliver to lstEducation control.
Why lstEducation.SelectedItem.
Thank you
ASKER
It works only if Selected="True" attribute is added:
Why it doesn't work with no Selected="True" in one of the items?
<asp:ListBox ID="lstEducation" runat="server" Width="205px">
<asp:ListItem Selected="True">High School</asp:ListItem>
<asp:ListItem>Associate's Degree</asp:ListItem>
<asp:ListItem>Four-Year College</asp:ListItem>
<asp:ListItem>Masters</asp:ListItem>
<asp:ListItem>PhD</asp:ListItem>
</asp:ListBox>
Why it doesn't work with no Selected="True" in one of the items?
Try
lstEducation.SelectedItem = Session("education")
lstEducation.SelectedItem = Session("education")
ASKER
Error 10 Property 'SelectedItem' is 'ReadOnly'.
I am getting this error.
I possibly need to cycle through the values and find index of some sort and then use the index value to select it.
I am getting this error.
I possibly need to cycle through the values and find index of some sort and then use the index value to select it.
ASKER
lstEducation.SelectedValue = Session("education")
works ok.
Thanks.
works ok.
Thanks.
Try moving your code in Page_LoadComplete. This ensures that the controls have been loaded.
Giannis