Is there any difference in using the following for checking for an empty control.
If txtBox1.text.tostring isnot string.empty then
vs.
If txtBox1.text.tostring <> string.empty
vs.
If txtBox1.tetxt.tostring <> "" then
Is there one simple test that a person can do that covers all options where there could be a null, or "" value. When I google, I see so many options. I see:
if txtBox1.text IsNot nothing
if txtBox1.text.toString isNot nothing
if txtBox1.text <> ""
if txtBox1.text.toString <> ""
if isNull(txtBox1)
Is there on test that can cover them all?
i have a
<asp:HiddenField runat="server" ID="ListTwoHiddenField" />
i have some programming aspect how can i check whether hidden field is empty or not i mean i want to check that ListTwiHiddenField.items.cout==0 or empty how can i check this
I have this code to check if the textbox is empty on lost focus. Setting IsAutoPostBack = True and using TexTChanged.
Code:
if (string.IsNullOrEmpty(TextBox1.Text))
{
<Code Here>;
}
The problem is when I make any no changes on Textbox1 and goes to the next textbox, this code doesn't work. so I cant trace if the textbox is empty or not
How do i check for empty array?
If I write
If Not ls_filename.Length = 0 then
....
End If
I get object refernce set to null error
why this code would not find the label? It is in an update panel, if that matters. I put in a breakpoint and it was not found.
[Code]....
I want to build my own web framework, and I want to build it in C#. I figure the easiest way to get started is to use ASP.NET to handle all the server communication stuff. The rest I want to build my self. I know next to nothing about ASP.NET. (But know C#, the MVC pattern, and other web frameworks quite well).
In Visual Studio 2010 I see
ASP.NET Web Application
ASP.NET MVC 2 Empty Web Application
ASP.NET MVC 3 Empty Web Application
I figure one of these should be good as a base. I just want some "entry point" into some C# code. I started with PHP so it's a little bit weird for me to not be able to just load up a file in my browser. Anyway, which should I use? What's the difference between a plain ASP.NET Web App and an empty MVC 3 app? If it's "empty" it shouldn't be using any of the MVC framework, should it? I just want to make sure I use the latest and greatest "ASP" for handling the server stuff before I embark down this road.
tell me where would I get Microsoft Chart Control sample codes ?Link will be sufficient.
View 4 RepliesI get an error using [Code]....
View 6 RepliesI have a simple linq query that queries the database, where QueryString = a value.
[Code]....
My issue is, if the query does NOT return any results, as the the data does not exsist in the table, hence returns 0 rows, it throws up an error which i understand. However, i have tried a few ways to check if the object has been created in the firstplace but to no vail. I have used Isnothing and DBnull but could not get it to work.
I have a checkboxlist control and a button control in a popup forum. The button is diabled initially. I want to enable the button as soon as the user checks or unchecks any of the items for the first time in the checkboxlist.
<asp:CheckBoxList ID="CheckBox1" runat="server"></asp:CheckBoxList>
<asp:Button ID="SaveButton" runat="server" Test="Save" Enabled="false" OnClick="SaveButton_Click"/>
How to achieve this functionality ?
I am using a DetailsView control to allow for updating a user record. Is there a way to check if the values are actually updated/changed when the update link is clicked. I know there are users, who would click the update button rather than the "Canel" even if there are no changes to the record. So, how do I check if any value has been updated when the update link is clicked. The DetailsView uses a SqlDataSource to populate the DetailsView.
View 4 RepliesHow to write an if condition, to check to see. only one can have value not both at the same time.
txtResubmitNoDays.Text or cpuResubmitDate.PostedDate.ToString
I have textbox A, B, C and D. Textbox A is optional, yet B, C and D are not required unless A contains an entry (then they are mandatory). What validation control do I associate with B, C and D that checks for an entry (anything other than being empty) in A? I don't see CompareValidator being able to do this so I was going to use a CustomValidator to perform server side validation (and possibly look into Javascript for server side).
View 2 Replieswhats the difference between hyperlink and button control in asp.net. in both we can display a image and give navigatetourl or href. then what is their difference.
View 5 RepliesHow to check FileUpload Control Empty or not?
I tried the following code,
But it was not working.
if ((this.FileUploadPanelToExcel !=null ))
I am creating a custom control and had a thought before I began. My control relies on the jQuery library to work. What if the user already has a version of the library already on their page. Will this effect anything? If my version is newer / older and my control will only work with that version of the libaray, what should I do?
View 1 RepliesI have a gridview with two bound fields. On clicking a button i want to display the values in first row of gridview in two textboxes. But if gridview cell is empty i am getting the text in textbox to which the value of cell is given as -' 'i know my problem will be solved if i use the template fields instead. But i want a solution while maintaining the bound fields ,if any.
View 2 Repliesi am new to this ASP.NET and AJAX.I am trying to learn AJAX. I Have one doubt.what is the difference between normal file upload control and ajax AsyncFileUpload Control ..?
View 4 Repliesi wrote code for mail sending, iam images in that mail also in that body i gave <img src="[URL]/Admin/imagesfolder/webdesign.gif"> bu it took <img src="[URL] now what can i do if giving some other website URL's it tooks prefectly.
View 2 RepliesLooking for recommendations for a control which make can do spell checking for various languages.
View 3 RepliesCan you tell the difference between Rating and RatingExtender asp.net ajax Control ?
View 4 RepliesWhen trying to use the editor control i'm getting the following error:
Value cannot be null or empty.
Parameter name: elementID
Here's my HTML:
[code]....
I'm using asp.net 4 with ajax control toolkit for version 4.
I believe the error is talking about the routing I have. Is there something special I have to do if I want to use the toolkit and custom routing?
I want to know which code or technique is used to write the code written below in url which is "3rhgf6v4zbos16x" what is this and how it can be generated in asp.net?
[URL]...
I have a web form and I have a user control on it. This user control contains a panel with some user properties that are to be stored in a database. So far nothing fancy. The user control itself contains a panel and is working fine (all code to retrieve and store the values is working).
I used the default settings of creating a user control and one of them was AutoEventWireup=true. This works fine because I also have some dropdown boxes (and other fields) that need to be filled with values from the database and that happens in the Page_load event.
The panel specifies the 'DefaultButton' which calls a method when clicked to save the values after the user has changed them.
On this click the code of the method is called, I confirmed that, but I found out that the values of my controls on the user control (for example the Textbox control) are empty. As a non-ASP.NET developer I couldn't figure out why. So I changed some settings like AutoEventWireup to false.
Off course this resulted in my dropdown boxes no longer to be initially filled, but my surprise was big to find out my controls actually contained the values the user typed in.
Logically I need both the values and the dropdowns filled, but for now it seems one or the other.