So I have followed this tutorial to try and me edit a record in a datalist.
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When I click update after updating anyfield it throws a NullReferenceException was unhandled by the user code. Here is my code.
protected void DataList1_UpdateCommand(object source,
I have a gridview,when i do it is giving me null object reference error.
I am posting my code for your reference -
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My gridview code is -
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i have code in item databound, but i want to move it to prerender... how do i reference the controls correctly in prerender? in item databound i use e.item....?, what do i use in prerender?:
protected void DataList1_ItemDataBound(object sender, DataListItemEventArgs e)
{
Label Label55 = e.Item.FindControl("Label55") as Label;
Label Label56 = e.Item.FindControl("Label56") as Label;
I have a gridview and when i click on the edit button i will get the modalpopup window which is having a popup window i want to update the data in that details view and refresh the data into gridview also.
View 2 RepliesI get all hotels with my datalist. a label shows hotel names and a texbox gets order. I want to update values without clicking Submit.
I placed scriptmanager and update panel. I dont know next step
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I am using asp.net 3.5 c#. I am trying to do this:
In one page, a user can insert some stuff (name, phone .. etc) to the database. And then the user should be able to see the rows he added as a list automatically in a datalist (or other control). As he inserts rows, it appears in the datalist.
I tried to use update panel and inside it datalist, with a button as a trigger but it did n't work with me!
Null Reference Exception was not handled by user Object Reference not set to instance of an object
View 2 RepliesWhy would i be getting NullReferenceException if im setting the labels with values?In my page_load i have the following:
Label hireMess = (Label)FormView1.FindControl("hireMess");
Label hireEnd = (Label)FormView1.FindControl("hireEnd");
HyperLink hyptry = (HyperLink)FormView1.FindControl("hyptry");
and right below that i have 1 condition to check for and then set the Text value of the 2 labels.hireMess.Text = "It Was Successfully!";hireEnd.Text ="You will be re-directed to your Pool in 10 seconds.";I compared the page to production and eveyrthing is the same and production doesnt have any issues.. not sure why its coming up null.The error comes up for the first label: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:
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i have null reference exception in grid view, in the
string s = ((Label)GridView1.FindControl("Label6")).Text;
i tryed this to e.Values["EventId"].ToString()
but still the some why is that?
the full code :
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i have datalist.i can bind datalist but problem is that null value does not bind.but all values are not null.
my scenerio is asign click btn click then view open then insertion and save.if free class btn click then another view open and then insertion...in asign class it can bind but free class not bind.while i m providing day and period also.so why they canot bind?
am using a gridview, which is inside datalist, but whenever I try to serach gridview in datalist it reyurns NULL. I using the following code, bolded line is not able to assign gridview:
amespace DataListXML
I have a question involving the ItemDataBound EventI have a linkbutton, btnOverview, that is displayed in a DataList ItemTemplate.I would like to select 1 of 2 imageurls for this button based on the value of haseOverview which is a field returned by the SelectCommend of the sqlDataSourcefor the DataList. I am not sure of how to reference this field.I have highlighted what I think is he relevant code section below.
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Probably a fairly simple one. Just need to know how I can make reference to controls in the HeaderTemplate of a DataList. I've got a form in there that I need to get the data from.
View 2 RepliesI have a typical gridview/formview master control setup. When I try to update or insert I don't get any errors but it also doesn't work. When I try to insert data all I get are null values and when I update, none of the values are updated. The formview looks like its working, but just doesn't. The primary key is an identity and it auto-increments by one.
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I cant get my datalist to update. There are no errors, but the data just stays the same when i click update.Also, can anyone help me with code to make the delete button work too?
View 5 RepliesI have a datalist and it contains a checkbox bound to a boolean value. I need to be able to scroll through the list, click on the appropriate checkboxes, and then update all using the button control. The only value in the sql table that needs updating is the checkbox, although other values are displayed. What is the simpliest way to do this. My code behind is C#. This is what I have now and it all works except for the actual update method being called correctly.
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In code behind my click event:
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I have a Gridview showing the data on one of my tables, and when I try to edit the data in one of the columns after I click update, rather than updating the record with the new value I typed in, the rows become null as in, everything in the row I just edited disappears. This inmediatly makes my application crash because one of the fields in my table (IssueDescription) doesn't allows null values.
This is the code, which is actually 100% auto-generated from when I created the GridView control and specified in the options to implement update, delete, edit options.
<asp:GridView ID="GridView1" runat="server" AllowPaging="True"
AutoGenerateColumns="False" DataKeyNames="ticketNum"
DataSourceID="SqlDataSource1" [code].....
What is making the rows turn into null after the update? I did some research and tried to define the Update behaviour myself using RowUpdating function. After hours of learning how to use it I got it to "work", but because the Update turns everything to null when it updates, the sqlconnection command I use to do the query sends null anyways. I can paste the C# code if you'd like to see it, though I'd rather not use it if the auto-generated by asp above can be fixed instead.
I have a datalist which is filled by a LinqToSQL query.
I have put a edititemtemplate in it, whith a update button,
Everything works fine, but when i ask the value of the textbox in update mode it still has the old value and not the new value typed from the textbox, anyone got a clue?
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Using vb.net/asp.net 2005.
I have to bind the value
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and I have the sqldatasource as follows:
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I am trying to update a table with a textbox value:
The details view:
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i have the code to test:
Cmd = New OleDbCommand("update TabEntrevistado set EntrevistadoConcluido=true where EntrevistadoCodigo =8", Con)
Now, I need something like this:
Cmd = New OleDbCommand("update TabEntrevistado set EntrevistadoConcluido=true where EntrevistadoCodigo =" + LblInfoEditar.text, Con)
The problem:
The LblInfoEditar is outside the datalist so it works fine. (note: in this label I put a value like the 8)
But I have this label to test because I need to access a label inside datalist:
<asp:Label Visible="false" runat="server" ID="LblNumEntrevista" Text='<%# Container.DataItem("EntrevistadoCodigo") %>'></asp:Label>
The problem is: in this line I've to put something to access this LblNumEntrevista HOW?
I try:
Cmd = New OleDbCommand("update TabEntrevistado set EntrevistadoConcluido=true where EntrevistadoCodigo =" +
ListaPendentes.LblInfoEditar.text, Con)
But of course I don't work because I can't do this...
I've got a master page where I've created two content place holders ('menu content place holder' and 'main body content place holder'). I've placed several controls (drop down lists and a calendar) in one of these content place holders (the 'menu content place holder'). In my content page I've set the 'menu content place holder' to 'Default to Master page content'. In my 'main body content place holder' I've included several controls (table, labels) which depend on the user selected items in the 'menu content place holder'.
After including a reference in all the necessary places- like this:
DropDownList ddlList1 = Master.FindControl("ddlList1")
as
DropDownList;
I still get the following exception (this exception occurs in my content page):
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:
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I have a FormView that is loaded with a records from my DB. Some of the fields may be blank or null. I am trying to check the value of some of the text boxes to verify that the user has updated the fields prior to allowing a DB update from the Edit Template.
I can not seem to get the correct syntax on the if statment to check the value of the text box....
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I have a class that derives from System.Web.UI.Page and have set my pages to derive from this custom page class instead of Page. At runtime, the controls are never initialized and throw a NullReferenceException. I've changed some class names and namespaces in the pasted code to protect the innocent. The only thing that I currently override in my PageBase is OnPreLoad and I do call the base.OnPreLoad. I'll eventually add more functionality to this PageBase but for now all that it has is this:
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I've tried putting this into a class library (with System.Web referenced) and I've also tried moving the class into the web application and had the same results either way. As another strange twist, I have another class with derives from PageBase called IndexPageBase and it doesn't have this problem:
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I am using dropdownlist in my view page with some values which will display corresponding ID(primary key of other table) in my database.If i leave my dropdownlist blank and save it in database then its showing null parameter error. Can you explain how to use this reference type to overcome this error
View 2 Replies