VS 2008 - How To Evaluate A Gridview / Form On Change
Dec 6, 2010
I have a form with 4 independent gridviews and I want to make some other controls, like the form's update button, visible when the gridviews have been corectly completed. I believe I should be doing this Client side so I have written Javascript that successfully evaluates the gridview controls for presence and correct data. Now I need to get the form to run this function, preferably in something like the gridview's onchange event, something that doesn't exist.
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Similar Messages:
Jul 8, 2010
I recently converted a web application of ours to VS 2008 so that we could upgrade to .net 3.51 framework.
I have been making some changes to the layout, to take advantage of ajax and minimize the amout of data needing to be loaded and the number of postbacks processed.
The problem I am having is when I try to save the data.
The page postback calls a local Sub which reads the form data into local variables and then passes these variables to our assembly.
The primary assembly has 70 parameters which are used to populate one of the tables in our database.
So I have 70 local variables just for this call plus a variable reference to the output of the assembly which contains a property for each of the columns in the associated database record.
There are some additional assemblies called to update other tables so, in all there are 121 locally defined variables in this sub.
Bear in mind that this sub is called from the page load event which has 93 of it's own locally declared variables.
Here is what is happening, when I run the code I am using cdate() to convert the value of a text box to datetime and pass it to my assembly. When doing so it throws a conversion error.
So I created a local datetime variable and converted the value of the control to the datetime and passed the variable to the assembly.
No more error, but the proc did not save the data as it was supposed to.
What I noticed in debugging, on the locals tab, is that every local datetime variable displayed the following message:
Cannot evaluate expression because we are stopped in a place where garbage collection is impossible, possibly because the code of the current method may be optimized
I also noticed that on the watch window the same message would display if I attempted to reference any of the datetime controls on the form.
There are only 3 variables and 3 datetime controls that appear to be affected. the controls are all html input boxes. Every other variable and control on the form behaves normally and I can see their values while debugging, it is just these six that are exhibiting the problem, whats more is that they are not new controls to the form.
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Aug 24, 2010
I have a gridview that displays the current weeks scheduled games. Ideally I have added a column to the end of the gridview that I would like display 1 of 3 values. If the game has already been played I would like to display the score of the game; if the game has yet to be played I would like the column blank and if someone on either team has indicated that they can't make the game I would like to display a button that says "subs needed" and take you to another page to sign up to be a sub. Can this be done? I have been able to change the background color of the line based on the two boolean flags from the database using the RowDataBound event handler but I can't seem to find a way to set the value of a specific field in my row. (The background is set for the whole row.)
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Mar 10, 2010
When the data is retrieved through a stored procedure using the SQLDatasource control that is binded to a gridview control, I want to change some data that is in some of the columns. Can i do this in one of the events either in the gridview or data control? I know you can do some formatting on the aspx page side such as dates, etc. but was wondering if I can do it on the vb code side?
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Feb 5, 2010
The dataGrid view is being populated. The Autogeneratedcolumns is set to false. How do I change the colour of a cell of a row depending on the text? i.e. Row 2, column 5 says "Failed". I would like to change the colour of that cell to be red.
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Jun 15, 2012
I have a gridview that I am loading from a stored procedure. I need to be able to hide certain columns and change the column names. Since it is loading with stored procedure the columns aren't listed in the gridview->edit columns properties.
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Jan 11, 2010
"Unable to evaluate expression because the code is optimized or a native frame is on top of the call stack." have redirected to a new page in repeater's itemcommand event. Error coming at line :
string url = "~/Galleries/AlbumImageList.aspx?UId=" + this.UserId.ToString() + "&AlbumId=" + e.CommandArgument.ToString();
Response.Redirect(url);
_COMPlusExceptionCode is -532459699
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Oct 10, 2010
I am preparing string expression to use it to insert statement like
str="insert into franchise (xx,yyy,xxxxx) values (" + rblxx.SelectedIndex + 1 .............
when I do so it simply concats the thing like value of rblxx.SelectedIndex "0" and 1 makes 01 and not 1.suggest some function and trick to add the numeric values not concat. I tried using System.Convert.ToInt32 but not worked for me.
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Jan 4, 2010
How do you evalute a null sql output paramater. I've tied several ways but can find one that works. I always get an error code of Conversion from type 'DBNull' to type 'String' is not valid.
I've tried both IsDbNull and if the value = nothing - both return the same error.
Code:
If IsDBNull(e.Command.Parameters("@JobCount")) Then
Me.lblInternalJobCount.Text = 0
Else
Me.lblInternalJobCount.Text = e.Command.Parameters("@JobCount").Value
End If
'I have also tried checking for nothing and that doesn't work either
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Sep 17, 2010
i am getting this error: Unable to evaluate expression because the code is optimized or a native frame is on top of the call stack.and this is my code where i am getting error.
if (Session["edit"].ToString() == "y" || Session["master"].ToString() == "y" || Session["del"].ToString() == "y")
btncancel.Text = "Cancel";
//txtprodesc.Text = txtpronm.Text = "";
ds = new DataSet();
ds =settcls.SelectallproductSuppliersetting();
if (ds.Tables[0].Rows.Count > 0)
[code]...
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Aug 24, 2010
When a sql query returns NULL , I can use the following code to evaluate:
[Code]....
When a sql query returns nothing, neither IsDBNull nor is Nothing works. I don't know why some sql queries return null while some return nothing when there are no data returned. But anyway, can somebody tell me how to evaluate nothing value returned in sql datareader in vb.net? When I put the cursor over signInfo variable in debug mode, I can see Nothing show as its value. But the line does not work
[Code]....
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Sep 19, 2010
The code was executing fine but now an exception is generated: "exc = {Unable to evaluate expression because the code is optimized or a native frame is on top of the call stack.}"
[code].....
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Jun 23, 2010
In my application when i debug in catch block this error is showing,given below
"[System.Threading.ThreadAbortException] = {Unable to evaluate expression because the code is optimized or a native frame is on top of the call stack.}"
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Mar 11, 2010
i'm having a serious problem when i' trying to use "HttpContext.Current".
What i' trying to do is to get a querystring value by:
"HttpContext.Current.Request.QueryString["..."]" (in my page base class)
But i got this error:
"Unable to evaluate expression because the code is optimized or a native frame is on top of the call stack"
What could be causing this problem?
[code]....
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Dec 8, 2010
I have a class...see code below
[Code]....
and I am calling the class using this syntax....
DataExporter.ExportToXLS(gvtemp,
string.Format("{0}.xls",
DateTime.Now.ToString("ddhhmmss")));
however, i am getting the exception, unable to evaluate expression because the code is optimized and usually, you fix it by adding a false to your response.redirect.
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Jul 22, 2010
In the WEB Application, there is a common FORM WebFrmDataShow.aspx which contains DataGridView control and comboxbox which contains the SQL SERVER Table names for the User to select to display the data on the DataGridView. It also contain this BEHINDCODE coding to allow the user to click and return to the calling Form.
<!-- Site navigation menu -->
<ul class="navbar">
<li><a href=" What Form Name">Previous Page</a>
</ul>
There are a few other FORMs which contain almost similar code TO load WebFrmDataShow.apx:
<!-- Site navigation menu -->
<ul class="navbar">
<li><a href="WebFrmDataShow.aspx">Previous Page</a>
</ul>
This FORM WebFrmDataShow.aspx when the user click on the Hyperlink I don't know which calling FORM to return to. SO HOW TO PASS THE CALLING FORM NAME TO THIS WEBFRMDATASHOW.ASPX?
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Feb 16, 2010
I understand that if you put a Response.Redirect inside a try-catch that you're going to get this error unless you specify the 2nd param of the redirect as false.But even looking at this article (PRB: ThreadAbortException Occurs If You Use Response.End, Response.Redirect, or Server.Transfer) I still don't understand why I have to set this to false for this particular line of code...we've always had true for that param until I wrapped that in a try-catc
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Oct 8, 2010
I have created a customer website which has a contact us form on which on submit populates a database. I would also like to send to myself the contents of the form in an email when the form is submit.All the examples I have seen seem to require the customer to have an email client and know their email settings to send from, since this can not be known how do I send an email. The website is hosted externally.
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Feb 3, 2010
I want the javascript function to be executed on the from load. SUppose I want the JS to be executed on the button click,say for example simple Pop Up. For dat we use the code
Code:
protected void Page_Load(object sender, EventArgs e)
{
Button1.Attributes.Add("onclick", "javascript : alert1();");
}
Code:
<script language ="javascript" type ="text/javascript" >
function alert1()
{
alert('Popup');
}
</script>
Can somebody tell me how to execute the JS on the form load?
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Aug 11, 2011
I want to change the color of my background on a textbox when the user typers stuff. For example I have two textboxes password and confirm password. On the second one if the passwords match I'm going to make the back color white if not red.
I can do this on WinForms easy as, same code on Web Forms and nothing happens. How do i do this???
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Feb 2, 2010
This may be a silly question but here goes.
I just installed Safari, Chrome, Opera and Firefox on my machine that runs VS 2008. Prior to this, IE was the browser used whenever I would run a project to test. Now it is executing Chrome, even though I said it's not the default browser.
Does anyone know how to change this setting in VS 2008 or wherever else it may be required?
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Mar 11, 2011
Visual Studio 2008/.net 3.5I have a web form with multiple slider in it. I need to show JavaScript alert in following scenarios when user changes vlaues on controls and tries to move away without Saving the information.User can go to different page by clicking on the Tab item or typing the address in address bar.Goes to different slider in same page using mouse click.
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May 4, 2010
Code:
[code]....
Secondly,I want to open the form a Modal Dialog Box,Is It Possible?/
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Apr 10, 2010
I'm not sure where this should go (I don't know whether it's a database problem, or a code problem), but I think it's a code problem, so I'm posting here.
I'm working with a database that is storing images (actually, it's a modified version of the AdventureWorks database from Microsoft), and I'm creating a form that will let you upload a file. I've got a business object based on the table that I'm using (Production.ProductPhoto) and I'm using two stored procedures to either get (Production.ProductPhoto_Get) or add (Production.ProductPhoto_Add) an entry from/to the table. The image is being stored as a varbinary field in the database, and a Byte() in my business object.
The problem I'm having is that when I'm adding a new entry and uploading a file, the length of the file uploaded is correct (so I assume everything is going smoothly), and it gets passed along to my ProductPhotoProvider DAL class where I create a DbCommand and add the parameters for my stored procedure. The information is all added to the database successfully, and I'm returned the identity of the new entry as expected -- however, when I try to read this image back, it seems that the length is 1. I've put in break points and stepped through everything, and I don't know what's going on.
I think that I know my ProductPhotoProvider class is at least reading things correctly -- I can display other images from the database (that came with the database, that is) just fine. Mine just all come back with a length of 1.
I'm just hoping someone knows what the hell I'm talking about; I have a lot of programming experience, but this is my first major venture into ASP.NET. I have no idea which parts of my code are relevant, so I'll just post my Add and Lookup functions for now?!
[Code]....
My ProductPhotoProvider class is based off of an abstract class called AbstractDALProvider (which I can also provide if needed). I can provide the rest of my project, if needed, too.
Oh, and for good measure: I was told that when you used to store images in Microsoft Access, there was some sort of problem when retrieving the data and you'd have to strip the first 72 bytes of data from it, or something. I can only assume that this is not a problem here, because I have no problem displaying other photos that were not created by me.
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Jul 23, 2012
How to design web form in telerik control ...using table row cell, etc etc ....
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