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If I understand your question correctly then I believe that a Session variable can help you.
You page should have at least two event handlers, one for Page_Load and one for your button OnClick event. Page_Load always executes first. When the page first loads it goes through Page_Load with IsPostBack == false and When you click the button it first calls Page_Load with IsPostBack == true, then it executes your Button_Click event where you should have the code snippet that you only want to execute one time.
Let's say here's your button click event handler:
public void MyButton_OnClick(object sender, EventArgs args)
{
if (Session("MyButton_Handled") == null)
{
// Your one-time code snippet goes here
// Set the session varaible
Session("MyButton_Handled") = true;
}
}
First time through the session variable will be undefined, which should return null. After you execute the code then the variable is defined and the one-time code gets skipped.
Ray Wampler
www.RayWampler.com
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hi,
thanks a lot for your reply,
this is what i wanted, but i need the 'dt' value outside the if(session...) statement.As this is giving me "the name 'dt' doesnot exist in the current context" error. And if i create 'dt' outside this session statement, dt is initializing for every postback...
foreach (GridViewRow row in GridView1.Rows)
{
CheckBox box1 = (CheckBox)row.FindControl("CheckBox1");
if (box1.Checked)
{
if (Session["MyButton_Handled"] == null)
{
DataTable dt = new DataTable();
dt.Columns.Add("Items");
dt.Columns.Add("Price");
Session["MyButton_Handled"] = true;
}
DataTable dt = (DataTable)Session["tablevalues"];
DataRow dr = dt.NewRow();
string name1 = row.Cells[2].Text;
double cost1 = Convert.ToDouble(row.Cells[3].Text);
dr["Items"] = name1;
dr["Price"] = cost1;
dt.Rows.Add(dr);
GridView2.DataSource = dt;
GridView2.DataBind();
Session["tablevalues"] = dt;
cost = cost + cost1;
Label12.Visible = true;
Label12.Text = "Total Price " + cost ;
}
thanks,
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Now that I see your code I think that I can suggest something that will work. You're already storing the data table in session, so you don't need an additional session variable your code can check for the existence of the data table in session.
If I understand the issue correctly then what you want is the first time through to create the table and store it in session, and each subsequent time you want to add a new row to the existing table.
First you create a helper function that returns a data table. This is where you check the session:
private DataTable ItemTable()
{
if (Session["tablevalues"] == null)
{
DataTable dt = new DataTable();
dt.Columns.Add("Items");
dt.Columns.Add("Price");
Session["tablevalues"] = dt;
}
return dt;
}
The above code will create the data table in session if it does not exist and then return it. It it already exists then it returns what's there.
You now change your button handler as follows:
foreach (GridViewRow row in GridView1.Rows)
{
CheckBox box1 = (CheckBox)row.FindControl("CheckBox1");
if (box1.Checked)
{
DataTable dt = ItemTable();
DataRow dr = dt.NewRow();
string name1 = row.Cells[2].Text;
double cost1 = Convert.ToDouble(row.Cells[3].Text);
dr["Items"] = name1;
dr["Price"] = cost1;
dt.Rows.Add(dr);
GridView2.DataSource = dt;
GridView2.DataBind();
cost = cost + cost1;
Label12.Visible = true;
Label12.Text = "Total Price " + cost ;
Session["tablevalues"] = dt;
}
The line of code, DataTable dt = ItemTable(), is going to get either a new table or table with the rows you added. You then add your new row, update the grid, and store the table in session.
I hope that's what you were looking for...
Ray Wampler
http://wwww.RayWampler.com
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oops, I just realized the first function has one line that's incorrect. It should be:
private DataTable ItemTable()
{
if (Session["tablevalues"] == null)
{
DataTable dt = new DataTable();
dt.Columns.Add("Items");
dt.Columns.Add("Price");
Session["tablevalues"] = dt;
}
return Session["tablevalues"];}
After your if statement then Session["tablevalues"] will exist. The code will either create it for the first time or will return what's currently stored there.
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thanks a lot..
it worked...
thanks once again
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Hi all,
On my website, I have a masterpage containing a textbox used for searching the site.
The other day I checked my errorlogs to see hundreds of validation errors where someone/something is tring to inject html to my search textbox on just one of the pages.
It is clearly some kind of bot as when I removed the textbox briefly, the validation errors started up on another page containing a textbox.
I have since added regular expression validators to my textboxes.
However, I am still getting the validation errors in my logs every 3-4 minutes, making it frustratingly hard to find any other errors that I may have failed to cach and deal with.
How is whatever is trauling the ages, ignoring my validators? if it's got javascript disabled, then it can't submit the textbox as it's posting back, so that's not the answer?
any suggestions anyone?
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markymark82 wrote: It is clearly some kind of bot
markymark82 wrote: if it's got javascript disabled
a bot with javascript disabled? What are you talking about? A bot is going to be using HTTP POST, what does that have to do with javascript?
Sounds like you need to look at some Firewall or ISAPI filter products that are capable of interrupting bot intrusions. I don't keep up with that market so I don't really know what the current products are like.
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The javascript reference was more for if something was being run through a browser, don't even know if it's possible as I've never had to deal with this before.
I figured that if there is a validator associated with the control, surely it can't be posted back unless it meets validation requirements, else doesn't that negate the validator?
Like I said, I've not had to deal with this before so my assuptions could be completely rubbish.
Cheers for the idea though, I'll start looking into it.
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Do you check for Page.IsValid on the server side?
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Admitedly I'm not, would I do that in thepostback method? or in the pageload method?
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It depends on how your application works i guess. Generally we end up with a 'Save' button on our pages, and we check it in the button click event, prior to processing whatever input we are given.
It's a good idea to always perform this check, because (as you've found out), you can't rely on JS validation.
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Excellent,
I'll try that and see how it goes.
It sounds like the kind of fix I'm looking for, cheers for the replies.
Mark
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Ok, so I've added that to the click event of the psting button and also to the text_changed event of the offending textbox.
But then I get another 3 attempts on it, how do I force the page to be loaded from the server rather than a cached version, and will that even work if the version being attacked is a cached version, that doesn't have code in it to prevent caching.
this is so frustrating, yet it has that feeling that it must be something simple.
I've found the following code to put in the page load event, that I think i'd need in the master page:
Response.Cache.SetCacheability(HttpCacheability.NoCache);
Will that make just the page always load from the server, or will all of the other objects on it (JS files, css, images etc.) be forced to load fresh aswell, I'd like these to stay cachable to reduce bandwidth.
Thanks for all the help so far, much appreciated.
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You can setup CAPTCHA to stop for submissions by crawlers or automated scripts. Free .NET CAPTCHA are available at-
http://recaptcha.net/plugins/aspnet/[^]
The page also gives you examples of how to integrate this into your form. Good luck!
Ranjit Viswakumar
Professional Services Specialist
http://hostmysite.com/?utm_source=bb
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Thanks very much,
I really appreciate it.
Mark
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Hi,
I have developed a user control that consists of a label and a datalist populated from a datatable passed to the control. This control is dynamically added to a content holder on another user cotrol on a page which represents a treatment session but on the first execution of the code only the label is populated with data after this though the page works correctly. Any help or ideas would really be appreciated thanks in advance..
Regards
Tim
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Hi,
I have been checking out this framework, and I see that they have classes that are part of the web project. I don't like having classes in my web project, but rather as DLLs. Does any one know why this framework does not create DLLs from projects? I think web client software factory makes use of projects for everything. If classes are part of the web project, does it take longer at runtime? I am looking for speed.
Please can I hear your comments.
Brendan
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It doesn't matter if you separate your code into a separate project. If you publish the website precompiled then the speed is the same. If you don't precompile then it will be slow when it compiles for the first user only.
http://msdn.microsoft.com/en-us/library/cc668225.aspx[^]
I didn't get any requirements for the signature
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The "class" vs. "dll" question is something many people ask themselves. A DLL is a container for classes, therefore when you create a class, it is compiled into a DLL/Assembly. You can simply create another "library" project and move your classes/code from the console project. Once done, then yes, you
have to add a reference to that assembly in your console application.
As far as speed and performance- it's not really faster either way. The contents of the DLL are made available, but not included. The use a DLL can clean up our code because it allows you to refer to class names without their namespace. You can compile one or more classes to a DLL and clean up your code this way. This may or may not increase your performance as a developer. Have fun!
Ranjit Viswakumar
Professional Services Specialist
http://hostmysite.com/?utm_source=bb
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I've spent an hour trying to do this and I can't figure out what's going on. I have a class that I derived from Microsoft.SharePoint.WebPartPages.WebPart. I built the program, and copied the dll's to C:\inetpub\wwwroot\wss\VirtualDirectories\3141\bin. I registered the WebPart through a dwp file. The webpart works great (queries a database and outputs text).
I'm trying to build a User Control and include it in the webpart. To do this I put this in the Web Part's Render method:
<br />
System.Web.UI.Control control = this.TemplateControl.LoadControl(@"WebUserControl.ascx");<br />
Controls.Add(control);<br />
because of various examples online. Program compiles fine. I copied the WebUserControl.ascx all over the place to over all the tutorials I found that had it different places.
Before I copied it to a lot of places I was getting WebUserControl.ascx file not found. Now I'm getting the exception:
Request Failed
Anyone have any ideas about what I'm not doing right? I'm not installing the dll to the GAC, I'm not sure if that has anything to do with it.
Thanks,
-Ken
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Ken, I could never do sharepoint programming. However, I know an easy way to use user controls in SP webparts.
Check this out. http://www.codeplex.com/smartpart[^]
This is the easy way to implement a .ascx as a webpart.
I didn't get any requirements for the signature
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Hi friends,
If i run my web application,it automatically shows a new window and which is having below message.
'An unhandled win32 exception occurred in WebDev.WebServer.EXE[4064]'
If i close that window automatically my browser also to be closed.
Whats the problem in that?
How to rectify this?
Please help me.
Thanks in advance.
Venkat
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Hello,
If it happens avter you've typed some code, you need just to trace and debug the code. Here is a video how to do it: http://www.asp.net/learn/videos/video-10.aspx
If it happens just on a new application, and have not typed anything.. just repair your Visual Studio instalation, or uninstall it and install it again.
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You may need to reinstall your visual studio!!
sepel
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This error usually only occurs if the program is trying to execute some data memory blocks. Try this out-
1) Right click My Computer > Properties...
2) Click the 'Advanced' Tab
3) Under 'Performance,' click 'Settings'
3) Click the 'Data Execution Prevention' tab
4) Select 'Turn on DEP for essential Windows programs and services only'
5) Restart
This option is selected by default, but with installation of SQL 2005 or Visual Studio it can change and cause this type of thing later. Good luck!
Ranjit Viswakumar
Professional Services Specialist
http://hostmysite.com/?utm_source=bb
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