DataSource Controls :: Cannot Work With System.Data.Linq.Table
Mar 31, 2010
Is there a way to do the following in VB:dim sTableClass as string = <my underlying table class in linq>dim dbTab as system.data.linq.table(<typed class of sTableClass>)I've tried cycling through the table objects of the linq data context and retrieved the following: Dim ddData = pkDB.GetTable(tt.RowType.Type.UnderlyingSystemType)(where tt reflects the row of the table I want to retrieve) But the expression returns and itable and I need the table equivalent but can't get this to work with a stri
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May 26, 2010
I am using System.Linq.Dynamic to create the following query at runtime:
[Code]....
I can then successfully display vMediaQ in a GridView.But I need to be able to access the individual fields (column headers and data) in vMediaQ, which is of type System.Linq.IQueryable.
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Feb 20, 2010
I have downloaded Visual Web Developer 2010 Express and am trying to use LINQ. In order to do that I have added a LINQ to SQL class to the web site and have dragged tables from the database view into the LINQ designer, which worked fine.But..When I add: using System.Data.Linq;to MainPage.xaml.cs, I receive an error:
Error 3 The type or namespace name 'Data' does not exist in the namespace 'System' (are you missing an assembly reference?)Even although I have references to System.Core, System.Data, System.Data.Linq in the website references.
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Mar 31, 2010
I wanted to delete the record from data but I receive this error "Unable to cast object of type 'System.Data.Linq.DataQuery`1[training_eval.Course]' to type 'training_eval.Course'.
Dim eval_sure = From ev In db.Evaluates Where ev.course_id = indexcourse Select ev.course_id
Dim del_course = From c In db.Courses Where c.Course_id = indexcourse
db.Courses.DeleteOnSubmit(del_course)
db.SubmitChanges()
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May 28, 2010
I have a strange problem. I am adding a LinqDatasource object, and set the context:
[Code]....
Then I get this error:The type 'System.Data.Linq.DataContext' is defined in an assembly that is not referenced. You must add a reference to assembly 'System.Data.Linq, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'.
On web.config I already have this:
<add assembly="System.Data.Linq, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"/>
NOTE: The datacontext is in a different project (DLL proect) where I added a refernce to System.Data.Linq.
is there another way adding a refernce to a web project? or only though teh web.config?
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Feb 9, 2010
Mmy data table has four columns. How can I get only selected columns name?
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Apr 20, 2010
I've added the Dynamic.cs file to my project and have set it's Build Action = Compile in order to get the System.Linq.Dynamic namespace.
However, when I try to use any of the new code I am getting an ambiguous call error; see below.
[Code]....
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Jun 29, 2010
how can i select a record from A table and insert into B table using linq?
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May 16, 2010
the same problem wuit hme here I wanna to convert from IQureable<int> to int type?
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Oct 21, 2010
I am having a lot of the same issue as this poster did with errors on initializing type.
I am trying to learn linq and am about ready to give up - don't get how this is easier...
I'm trying to do a simple update to product names in the product table based on the manufacturer ID
In order to do this I am looping through each record. I was initally successful with changing all names in the column but when I try to query the data, I continually run into multiple problems.
The following poster has had the same issue I have but his solution isn't working for me.
[URL]
I keep getting the same error on the opening bracket on the select statement in the SelectByManufacturerID function...
Error 1 Cannot initialize type 'DataBaseDataManagement.ProductName' with a collection initializer because it does not implement 'System.Collections.IEnumerable'
Button that does the actual updating...
[Code]....
The function that the button calls to get the query... ERROR
[Code]....
The class located in Query.cs...
[Code]....
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Feb 26, 2010
I have records with and without a email entered in the field called 'email'.
This one works:
Return From p In db.myTable _
Where p.Email.Length > 0 _
Select New With {.p.Name, p.Email}
but this doesn't
Return From p In db.myTable _
Where p.Email.Length = 0 _ ( nor does Where NOT p.Email.Length > 0 )
Select New With {.p.Name, p.Email}
Am I missing something?
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Apr 3, 2010
I am running the folowing simple test code:
[Code]....
But the UpdateUser field does not update - it remains at NULL. No errors occur. I can use similar code to update table fields in other dbmls successfully.
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Jul 1, 2010
from user in db.users
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May 14, 2010
i am new to this linq concept,
i have used the following code to delete multiple records in my table,
but when i hit the button insteading deleting multiple records only one record is getting deleted
below is the code
protected void Button1_Click(object sender, EventArgs e)
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Apr 19, 2010
I have just started using LINQ with VS2008. I have added extra columns to my table, saved the changes, but class ClassName.Designer.CS didn't get updated. What do I have to do to updated the class? Do I have to do it manually, or is there a way to automatically synchronize tables and ClassName.Designer.CS?
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May 25, 2010
I have a table added to a dbml file in my website. The website is already deployed to Live server. Now I have been instructed to a add a new field to the table. The field will be defaulted as getdate().
I don't plan to modify my dbml file for this change since the filed holds a default value. Will it cause any issue(performance related or any other). I am sure that I will not have to use the newly added field in the website. I am new to LINQ.
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Oct 19, 2010
I have been google some but I can´t find any solution that have been worked for me. I do use System.Net.mail on my site to send emails to individual employes. Now I would like to be able to email all emplyees. The emplyees email address is stored in a MS SQL table. Is it possible to make a BCC email to all employees in that table?
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Jul 11, 2010
I am trying to update my table ARTICLES and it has a field COUNTER, Everytime a user enter this ARTICLES, the page_load event runs a LINQ to SQL query taking the QueryString as parameter, increasing the COUNTER field in 1.
[Code]....
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Aug 20, 2010
my table column is:
AttachContent varbinary (max)
when i try to retrieve the data and i get this below error, i am using linq
cannot convert from 'System.Data.Linq.Binary' to 'System.IO.BinaryReader'
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Jul 12, 2010
in my web project i got an error that i couldnt find any solution. the error says: System.Security.SecurityException: Request for the permission of type 'System.Data.SqlClient.SqlClientPermission, System.Data, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' failed. when i work in local there were no problem i put files to our server and i changed the database also. when i work in server in web application in Default.aspx i can connect db and get values without any problem using my DataLibrary
BUT the problem in my web service i also use my DataLibrary in webservice but when i try to run a method in web service it gives me the error which is : System.Security.SecurityException: Request for the permission of type 'System.Data.SqlClient.SqlClientPermission, System.Data, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' failed.
my new db connection is
strConnectionString = "Data Source=OURSERVERNAME\SQLEXPRESS;Initial Catalog=DoveTR;Persist Security Info=True;User ID=sa;Password=123456789;Pooling=True";
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Jul 21, 2010
I need a Listview that will show info from several database tables. My delete button, will not delete the record from the database. I cannot get DeleteOnSubmit() to work at all. I am in the very beginner stage. This is my first project. I thought this would be a good project for learning purposes.
Here is my code:
[Code]....
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May 6, 2010
I have a dillemma.. or more of a design hump.
I have a web application that allows a number of teams to be assigned placement rankings, thus giving the players on that particular team.. seed points.
I am stuck as to how to use a Gridview to display the Teams, then allow a ranking to be assigned to each team.
(Dont allow more than one number per rank [no two teams can ever tie, or have the same finishing place.
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May 7, 2010
I am getting this compilation error"
All my pages are receiving this error - website is down; here's the code:
[Code]....
Except my web config file shows linq is accounted for? [Code]....
I would note that I updated to VWD Express 2010 then had to revert back to 3.5 because my host at Arvixe had not updated my server yet. He then said he updated it and I reverted up to 4.0 again. It turned out he hadn't and I tried to revert back...and then this showed up and numerous other errors.
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Jun 13, 2010
Basically i deal with two tables.i have a table T1 of the following format:id company_name i need to read this data and create a table T2 as followsi wrote the following code. it worked fine for retrieving data and modification but fails to insert the modified data into the 2nd table.the error is, it does not recognise the value for @token
ArrayList dynarr=new ArrayList(); // global variable
protected void Button2_Click(object sender, EventArgs e)
{
int row = 1; int i;
string strcmd = null;
string Connection = "Data Source=....";
SqlConnection conn = new SqlConnection(Connection);
string str = "select company_name from T1 where ID=@ID";
[code]...
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May 15, 2010
May you tell me how can I transfer data from a table to another table, the condition of non-repetition rows
as a procedure in database MS QSL server 2005 ,Works in the first day of the month I use the first table in the prodation environment it is contain the employee data and the second to update first table only
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