Understanding Special Symbols In .aspx?
Jun 24, 2010
Special symbols are a real pain to learn about because you can't Google for them (try doing a Google search for "<%#" and you's get nothing).
I've been a programmer for many years, and I'm trying to get my head around ASP.net, and especially the "special symbols"; what they mean, where to find out more information about them. Because they're impossible to search for, it'd be wonderful if there were special resources in place to help newbies learn about these.
Specifically, I'm looking for detailed instructions on the porpose for, and use, of the following constructs:
<%@ %>
<%$ %>
<%# %>
<%= %>
What is expected in each, what is allowable in each, and what "gotchas" would a newbie have to be careful for when employing each.
For example, I want to do some coding in a <%# %> block, like:
Text="<%# if (Eval("InUse")) {Eval("ProductName")} else {"Not In Use"} %>"
-- would this be allowable, and if not, what are reasonable alternatives?
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Jan 3, 2011
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[Code]....
[Code]....
[Code]....
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Jun 22, 2010
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Jan 26, 2011
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Jan 10, 2011
IS it possible to use mathematical symbols in asp.net application.
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Aug 8, 2010
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Nov 9, 2010
I've searched for about a day and a half and have not been able to find an explanation that I can understand, so please forgive me if this is something you have seen/answered before.
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Jan 24, 2010
Quesion 1:
How to check if a string str1 has at least one of such symbols: ~#$%^&*()[]{}@
Is it possible to solve this quesion using Regex? Any smarter way than this:
If InStr (str1,"~") or InStr (str1,"#") or Then End If
Question 2:
How to check if a string str1 consists of any combination of such symbols without any other symbol: ~#$%^&*()[]{}@
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Sep 26, 2010
Asp.net 3.5 using code behind I am using a repeater control. My datasource appears in code behind. I decided to NOT have my listitems populate from the database. I want the user to select a value, send it to the database via an update statement, and then when the user returns to the page (on pageload), have the user's previous selections appear on the screen. note the following:
When I use textboxes and labels, ALL of my data appears within the table of the repeater control. However, when I replaced one of the text boxes (originally used for testing purposes only) with a dropdownlist, I get the following error message'ddlDDuring' has a SelectedValue which is invalid because it does not exist in the list of items.Parameter name: value My Repeater1_ItemCommandI updates the data within the repeater perfectly. On page load, I want the data from the database to display as the dropdownlist's selected value (or selected item.text). Here is my Asp code
<asp:Repeater ID="Repeater1" runat="server"
onitemcommand="Repeater1_ItemCommand">
---
<
td><asp:Dropdownlist ID="ddlDDuring" runat=server SelectedValue ='<%#Bind("DueDuring")%>' >
<asp:ListItem Value="-select-" Text="-select-" />
<asp:ListItem Value="1st half" Text="1st half" />
<asp:ListItem Value="2nd half" Text="2nd half" />
<asp:ListItem Value="Split" Text="Split" />
</asp:Dropdownlist> </td>
---
C# code behind
protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
---
string myConnectString = ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString;
myConnection = new SqlConnection(myConnectString);
strSelect = "SELECT * FROM UserExpenses WHERE UserId=@UserId";
mySqlCmd = new SqlCommand(strSelect, myConnection);
myConnection.Open();
mySqlCmd.Parameters.AddWithValue("@UserId", LoggedOnUserId);
myReader = mySqlCmd.ExecuteReader();
Repeater1.DataSource = myReader;
Repeater1.DataBind();
myReader.Close();
myReader = mySqlCmd.ExecuteReader();
while (myReader.Read())
{
ExpAmount = Convert.ToDouble(myReader["Amount"]);
TotExp += ExpAmount;
---
I tried the following code changes on asp page: I changed "SelectedValue" to "Text" and still get the same error message I changed "SelectedValue" to "SelectedItem" and don't get the error message, but dropdown is not populated I set AppendDataBoundItems = true Set first list item value = "" Verified that every field in the table column matched the items in the dropdown list. There were NO null fields in the database.
I just want to understand this error message, as I have exhausted all that I am doing. I also made an attempt to bind the dropdown list, but sine this can only be done within the loop of finding the repeater control, I would either get an error message, or it just would not work.
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Aug 24, 2010
It was doing exactly what I expected until I added more than 1 property to it. It seems if I set the value of a property this, in turn, sets every property in the handler to the same value.
I figured it had something to do with the "shared" but if it's not shared then I would have to declare an instance on my page which would kinda ruin the state of my variables (otherwise, I'd just put them all in my class), right??
[Code]....
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Aug 5, 2010
I get following code (no server error, no html tags nothing... what I am copy pasting is FULL source code).
[Code]....
This goes on in several lines, no eed to repeat it all. There are no html tags, no server error... nothing. It happens on 3 pages, and only common things they have is a texbox TextMode="Multiline"... on first 2 it helped if that text area was empty or without any strange characters.But on 3rd one, I am simply raising postback from a checkbox to display or hide a corresponding textbox... so no data is being sent nothing..... I am totally baffled with this...
Edit: This happens on 2 IIS server (my local machine and other remote IIS that I use) but Cassini actually gives me a message error!
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Feb 25, 2011
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My VS solution is four projects, all are DLLs, and one is called directly by my web application and it calls the others. There are two I am interested in debugging as I am enhancing them.
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Dec 4, 2010
I have to display math symbols in the label text for checkbox. I have created the symbol in MSWord but dont know how is can do that in the website.Is there anyway I can do that.
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Feb 25, 2010
RegularExpressionValidator.ValidationExpression="d{10}" means only digits - 10 max.
RegularExpressionValidator.ValidationExpression="d{10,12}" means only digits - 10, 11 or 12.
How to force strictly 10 or 12 symbols?
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