Data Controls :: Populate DataList Based On QueryString Value Throws Error When QueryString Is NULL Or Blank
May 7, 2015
The following code works well as long as I pass a querystring value to the datalist.
Private Sub BindGrid()
Dim id As Integer = Integer.Parse(Context.Request.QueryString("id"))
Dim strConnString As String = ConfigurationManager.ConnectionStrings("Conn").ConnectionString
Using con As New SqlConnection(strConnString)
Using cmd As New SqlCommand()
cmd.CommandText = "select Id, Name from tblFiles where Id=@Id"
[Code] ......
However, the page errors with the message "Value cannot be null." if I don't pass a value. I know that DataList does not have an EmptyItem Property like a Gridview control. I do not want the page to error if I don't pass a value. Need info to deal with empty values in a datalist.
Most websites have pointed me to this code to use:
The 'list' throws an error. The error is "Too few type arguments to 'System.COllections.Generic.List". I am not sure if the code is written in C# and that is what is causing the error. It seems that it should work but I can not figure out the 'list' error.
I am using a Datapager in my project with a ListView control. The Datapager is set to use a querystring value Page, so that a typical URL looks like: [URL]. The problem is that the ListView throws an ugly error if the pageview is invalid (0, for example).
The error is: Specified argument was out of the range of valid values. Parameter name: startRowIndex
The error originates in the ListView SetPageProperties method. What is the best way to address this? Can I override the SetPageProperties method in some way, to check the startRowIndex parameter? Here's a very simple page that replicates the error: [URL]. A copy of a simple webapplication project demonstrating the error: [URL]
I want to paging my datalist but the datalist takes a querystring field catID from categories repeater. How can do I paging my datalist with catID querystring?
I am simply trying to get a querystring value and pass it to a textbox in a formview with the default view set to edit mode.
Protected Sub fv_Detach_Engine_DataBound(ByVal sender As Object, ByVal e As EventArgs) Handles fv_Detach_Engine.DataBound If fv_Detach_Engine.CurrentMode = FormViewMode.Edit Then Dim tbx_IDProfileAccount As TextBox = TryCast(fv_Detach_Engine.FindControl("tbx_IDProfileAccount"), TextBox) If tbx_IDProfileAccount Is Nothing Then tbx_IDProfileAccount.Text = Request.QueryString("IDProfileAccount") End If End If End Sub
I have a form that has 2 querystring variables ID and FormID being passed to the page. Also on this page I have 2 different DataSources that outputs to a Detailview depending if the FormID is 1 or 2. I would like to be able to add a show/Hide command to Show only the DetailView that is selected and Hide the other. I have researched and found hat people are using a Multiview code, but I have not been able to find a working example code.
Here in below code i have used querystring for sending imagename from this page to another page. Now i just want that with this imagename in also want to send span element's text with same querystring.How can i achieve this?
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load Dim myText As TextBox = TryCast(DetailsView1.FindControl("TextBox2"), TextBox) Dim QS = Request.QueryString("MenuLinkID")
specify a querystring to be always null when there is no value to pass?I always get an error saying NULL can't be converted to INT.The SQL datatype for this querystring is int.
I wanted to ask about URL rewriting. I want to map this: [URL] To: [URL] Being DVD players product id 123.
Also I will like to map sub domains like this: From: [URL] To: [URL]
Being John Doe user id 123. I will like to do this by getting the respective ID (for products and users) from a database based on product id name (dvdplayers) and sub domain name (johndoe). Where can I intercept these 2 (sub domain string and product name string) and based on this getting the info from DB and "rewrite" the URL's?
I have a repeater control that generates a dynamic menu in an unordered list format. I have given each <li> item an id that includes a value from my database to make them unique:
<li id="category<%adding in my dynamic value from database here%>"><a href="#">Some Link</a></li>
One of the values that gets added to my list ids will match my querystring, making it the current page. So therefore I would like to highlight this to the user by changing the css class of the relevant li element. In my code behind I have created a string variable that takes the querystring value and modifies it to match the id. So for example my variable is "category7" - and I also have an li item on my page with an id of "category" How would I go about matching these two things in my VB and adding a class to the li element where the id = my variable.
My querystring has 2 parameters say pm1 and pm2. I want to check the value of each and if the value if '1' then pop open a new window(one for each parameter) and the url for the two windows will be different.
i have web application which can be accessible by [URL] but I would like to create a url which does not have any query string parameter. this should be accessible by [URL] (e.g athar is client name) I have download the Intelligencia.UrlRewriter.dll from the internet. but when I run this i am getting error could not found assemply.
I've got a datalist sitting inside a modal popup and i'd like to pass a querystring value to it when the user clicks to open the modal popup.an anyone point me in the right direction?Written w/ C#.
I have some WCF services that I want to return in different formats based on a querystring param. For example, [URL], [URL], [URL], etc... This would make it so that many different types of clients could consume the services whichever way was easiest for them, such as binary for a .NET client and json for an ajax or Flex client.
What I'm thinking is that I can have the WCF web methods return their .NET business objects and not worry about the output mode and then have a behavior that hooks in after returning from the web method which checks the querystring for this param and either:
1. Continues returning the business objects if the mode is dotnet.
2. Converts the business objects to xml if the mode is xml and returns a string of xml.
3. Converts the business objects to json if the mode is json and returns a string of json.
In my asp.net+vb web with access database there is a page which displays data as per query string and the string is PNO and all data is correctly displayed in gridview and dataview. there is a Image1.ImageUrl and i used the following code but it is not working
Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) Dim PNO As String PNO = Request.QueryString("PNO") Image1.ImageUrl = "C:/wing/Photos/" + PNO + ".jpg" End Sub
Suppose, I sent a value from 1 page to another [ex:5] then on another page where i sent the value I want to display that many TextBoxes 1 by 1 means 5. I want to read all the values and want to store it.
Once the another page got the number It will display :-
Enter Product 1 Quantity : TextBox1 : I will enter the quanity next
Enter Product 2 Quantity : TextBox2 : I will enter the quanity next
till TextBox 5 / number
Basically, my idea is I want to generate the bill according to products which my worker carry. So I will enter my worker id and I will ask him how many products do you have. I enter the number. suppose 5. then that many textboxes will appear on the form and i will just enter there quantity.
