I Get this stupid error when I try to update one of my products.Can some tell me why and how I remove the error?
Error:
Column 'CategoryName' is read only
http://img88.imageshack.us/img88/9123/errorscreenp.jpg
this is my caregory table:
View 5 RepliesI've a web form with a dropdownlist and textbox. The dropdownlist are categories, and I want the textbox to display the categoryID of the selected dropdownlist CategoryName. How can I do that? The dropdownlist is binded with values from database.
View 7 RepliesI have a List of Items which is binded to GridView:
class Item
{
public string CategoryName { get; set; }
public int CategoryID { get; set; } [code]...
All that I need to show the CategoryName in the alert window instead of 'Hello world'.
Server Error in '/' Application. Attempted to read or write protected memory. This is often an indication that other memory is corrupt.Description: An unhandled exception occurred during the execution of the current web request. review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.AccessViolationException: Attempted to read or write protected memory. This is often an indication that other memory is corrupt.
Source Error:
An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.
Stack Trace:
[code]....
I want to read complete column from the dataset using select command or whatever without looping the rows of the table.Because in table i got 35000 records i only want to read a one complete column from the top to the end using dataset.
Eg: select column_name from table.
lly, dataset.tables[0].select["Column='Product'"]
I have tried with this but throwing exception.
I have read the excel in asp.net. I am using OledbDatareader for read the column name.
[Code]....
Now my problem is the "date" field. If Excel sheet having column name "Date" then i got the error. i could not use the Column index because its also not fix. How can i ignore the upper case charactors in column name ?
i want to read last 20 record of a column in c# code
View 2 Repliesim trying to read column names from excel .
View 3 RepliesI am creating a BLOG and Forum, and am using tags similar to this and most other sites, I just need to know how to retrieve the tags from a culmn if the tags are stored with commas separating them, I am sure I read about it somewhere but was unable to find it.so the column would be:
tag1, tag2, tag3, etc.....
I would need to be able to:
1. Store tags, and add-on to tags already in the column
2. retrieve the tags as a list, or separately
I am using VS 2010, C# and Sql server 2008. I am having a list returned from the database. I am trying to convert the
list to a dataset.
I am getting the error as "Cannot set column 'column name' to be null. use DBNull instead.
This is the code i have used:
[Code]....
How to fix this?
I need a way to read all the rows in one column from an Excel file that the user picks from a fileupload control. I tried saving the excel file on the webserver with the upload control and then opening it with a OleDbConnection but that fails when running it from the webserver and gives the error:
Request for the permission of type 'System.Data.OleDb.OleDbPermission, System.Data, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' failed.
This works fine when just running it localhost, so i figured it might be a problem with security level at the webserver which i cant change. Instead i tried doing it with a streamreader direct from the fileupload control and because theres no need for saving the excel file on the server, but im not sure how to query the rows i need this way.
I am using Gridview and on that data is binded conditionally.the problem is that at the time of editing whole row of the grid is in editable mode and i want only few of the columns editable. my code is as follows
[code]....
How do add read-only computed column in LinqToSql designer (dbml)? My existing table structure:
Name: ID, Type: int, AutoGenerate: true, AutoSync: OnInsert, PrimaryKey:
true, ServerDataType: int not null identity, Source: IDName: Name, Type: string, ServerDataType: nvarchar(100) not null, Source:
NameName: Value, Type: byte[], ServerDataType: VarBinary(max), Source:
Value, UpdateCheck: Never
I want add the 4th colum name: Name: HasValue, Type: bool --> [Value] != null
I want to read from database where I've stored a image in binary field and display a image.
while (reader.Read())
{
byte[] imgarr = (byte[])reader["file"];
Stream s = new MemoryStream(imgarr);
System.Drawing.Image image = System.Drawing.Image.FromStream(s);
Graphics g = Graphics.FromImage(image);
g.DrawImage(image, new Point(400, 10));
image.Save(Response.OutputStream, ImageFormat.Jpeg);
g.Dispose();
image.Dispose();
}
con.Close();
This piece of code doesn't work:
System.Drawing.Image image = System.Drawing.Image.FromStream(s);
I tried the code from this article. And I got the same mistake " the parameter is not valid ". Maybe I'm not aware of something, some setting in sql server or webconfig or sth else. Anyone else who has experience from fetching images from database? The parameter is not valid is the error message. db table contains data. What am I doing wrong?
I have a simple little web page that is trying to read a "Sharepoint Search Service" Web Service. When I try to execute the highlighted line of code, I get the following error:
Code:
Data at the root level is invalid. Line 1, position 1.
Here is my code:
Code:
Protected Sub btnParse_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnParse.Click
Try
Dim xmlTemplate As String = ""
xmlTemplate += "Your search cannot be completed because of a service error"
Dim ds As New DataSet
queryService.Url = "http://cscacmxxd001/_vti_bin/spsearch.asmx"
queryService.Credentials = New System.Net.NetworkCredential("MyUserID", "MyPassword", "cs")
ds = queryService.QueryEx(xmlTemplate)
If ds.Tables(0) IsNot DBNull.Value Then
For Each row As DataRow In ds.Tables(0).Rows
MsgBox("Made it here!")
txtParsedData.Text &= row.Item(0) & vbCrLf
Next
Else
lblMessage.Text = "There is no data!"
End If
Catch ex As Exception
lblMessage.Text = ex.Message
End Try
End Sub
We have a process that calles a url to pull an image (in this case a .tif image) and it calls this function which works most of the time but recently is getting errors. If I step through the While loop of a 92k file it gets to the end and then errors on the following line:
nBytesRead = stStream.Read(baBytes, 0, MAX_BUF)
I have added a Try/End Try statement which appears to work but is there a better option?
The error I get is:
System.IO.IOException: Unable to read data from the transport connection: The connection was closed.
Code:
Private Function ReadAsByteArray(ByVal stStream As Stream) As Byte()
Dim msBuffer As New MemoryStream()
Dim swWriter As New StreamWriter(msBuffer)
Dim nTotalBytesRead As Integer
Dim nBytesRead As Integer
Dim baBytes(MAX_BUF) As Byte
nTotalBytesRead = 0
nBytesRead = MAX_BUF
While True
'ORIGINALLY THE TRY IS NOT THERE
Try
nBytesRead = stStream.Read(baBytes, 0, MAX_BUF)......
I set debug=true in web.config file but once app got error only display general error message. I have to run app in web server to get error detail.
How to make error detail in client site so that I can read error detail?
When executing this line:
Dim roleRedirectSection As LoginRedirectByRoleSection = DirectCast(ConfigurationManager.GetSection("loginRedirectByRole"), LoginRedirectByRoleSection)
...I get the following error:
Message: "An error occurred creating the configuration section handler for loginRedirectByRole: Could not load type 'sitename.LoginRedirectByRoleSection'. (W:Webs2010DEVsitenameASP 4.0web.config line 10)"
<configuration>
<configSections>
<section name="loginRedirectByRole" type="journeyeast.LoginRedirectByRoleSection" allowLocation="true" allowDefinition="Everywhere" />
</configSections>
<loginRedirectByRole>
<roleRedirects>
<add role="Administrator" url="~/Account/Admin/Default.aspx" />
<add role="Employee" url="~/Account/Emp/Default.aspx" />
<add role="Teacher" url="~/Account/Teacher/Default.aspx" />
<add role="Student" url="~/Account/Student/Default.aspx" />
<add role="School" url="~/Account/School/Default.aspx" />
</roleRedirects>
Question: I have an annoying problem with nhibernate.The problem is I cannot get any example I find on the web to work... I've now tried for two days...
The first problem was it wouldn't read the config file, so I had to move it into app.config / web.config.
The second problem is that whatever I do, I always get an error:
No persister for: NHibernate.Examples.QuickStart.User
I've searched google and I did change the mapping to embeded ressource, and I did add the mapping to the config file, but nothing helps...
The example is from this page:
https://www.hibernate.org/362.html
I've uploaded my Visual Studio 2005 project to
http://daniel-steiger.ch/exchange/NhibernateCrap.rar
My query is that I have an sql field for image with db type "Image" , now I have successfully inserted some images in the form of bytes, now how to read those bytes of image from database and convert, show in gridview?
View 1 RepliesI am running a 4.0 environment on my development machine (VS 2010 + .NET4) and my server (2008 SERVER + just installed .NET 40). On my dev environment, I don't get any errors, but with the same web config on the server, I get: Error 500.19 - The configuration section 'system.web.extensions' cannot be read because it is missing a section declaration
[code]...
I've created a connection to a read only Oracle database but when trying to execute a very simple SELECT statement it generates the following error:
"database open for read-only access"
I've tried a datareader and dataadapter so its looking like a specific issue or protocol with the database that I am unaware of.
I am new to asp .net and working on a already live project.When i am trying to run my application i am getting the following error:Explanation:The error occurred necessary for the processing of this demand while analysing the resource. Please confirm details of the following analytical errors, and make a change to the source file.The purser error message: Type 'HOME_MasterPage' was not able to be read.
Line "C#" 1:< %@ Master Language = , "True" AutoEventWireup = , "HOME_MasterPage" Inherits = , and line 3:< html xmlns = "Http://www.w3.org/1999/xhtml "-// W3C//DTD XHTML 1.0 Transitional//EN" and "Http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"
>" of "MasterPage.master.cs" % Codebehind = > line 2:< DOCTYPE html PUBLIC >
I set debug=true in web.config file but once app got error only display general error message. I have to run app in web server to get error detail.
How to make error detail in client site so that I can read error detail?