.NET Tutorials, Forums, Interview Questions And Answers
Welcome :Guest
Sign In
Register
 
Win Surprise Gifts!!!
Congratulations!!!


Top 5 Contributors of the Month
Easy Web
Imran Ghani
Post New Web Links

LINQ: Problem in fetching data

Posted By:      Posted Date: September 17, 2010    Points: 0   Category :ASP.Net
 
Hi, i am developing something in LINQ, in this i am using some query for selecting data like this:var data = (from w in db2.TextSubCats where w.SubCatName.Trim()==reci_i.Recipe_cat.Trim() select w.SubCatName);but how could i fetch this data, i knows there is a solution by using foreach statement like this:foreach (var data_i in data){}my problem is this, if there no data returned by query then this foreach statment is just skipped.....so how could i get data returned by query in string so that i could perform my string manipulations... Thanks for your time.


View Complete Post


More Related Resource Links

Problem while retrieving data from a lookup column from sharepoint linq.

  
Hi I am working with sharepoint linq concept. When I am giving a query with lookup column It's working fine.  But when i am trying to retrieve the data from a look up column to spgridview. I was unable to get the output. Here is the above code which i have worked.   string strTitle = string.Empty; string strStatus=string.Empty; var context = new LinqSampleDataContext(SPContext.Current.Web.Url); EntityList<SharePoint2010ConceptsItem> Concept = context.GetList<SharePoint2010ConceptsItem>("SharePoint 2010 Concepts"); var query = from cs in Concept where cs.Status.Title.ToString()!="Completed" select new { cs.Title, cs.Id, //cs.Status }; sgvConcepts.DataSource =query; sgvConcepts.DataBind();   Any help me plz how to retrieve the data from a lockup column.bvnprasad

Problem with Retrieving data from lookup column using SharePoint 2010 Linq Concept

  
Hi I am working with sharepoint linq concept. When I am giving a query with lookup column It's working fine.  But when i am trying to retrieve the data from a look up column to spgridview. I was unable to get the output. Here is the above code which i have worked.   string strTitle = string.Empty; string strStatus=string.Empty; var context = new LinqSampleDataContext(SPContext.Current.Web.Url); EntityList<SharePoint2010ConceptsItem> Concept = context.GetList<SharePoint2010ConceptsItem>("SharePoint 2010 Concepts"); var query = from cs in Concept where cs.Status.Title.ToString()!="Completed" select new { cs.Title, cs.Id, //cs.Status }; sgvConcepts.DataSource =query; sgvConcepts.DataBind();   Any help me plz how to retrieve the data from a lockup column.bvnprasad

Problem with adding custom propety to a data class using Linq.

  

Hello,

I tried to add a custom property to the data model:


public partial class Department
    {
        public string ExtensionIdName
        {
            get
            {
                return Extension.ExtensionName;
            }
            set
            {
            }
        }
    }

It seems that it works, but when I bind the data to a ListView it shows all the properties except the property I added manualy (ExtensionIdName).

Am I missing something or is there something wrong?


Problem in fetching data from Mysql

  

Hi,

    I want to fetch data from mysql database to asp.net dropdown control. How can I do this.

I can fetch data from ms sql server to asp.net page. Please help me to fetch data from mysql database.



Thanks.....



Linq - add data to database then email user the details

  

Hi all

I'm not sure how to structure the code for this but what I want to do is be able to add data to a database, and once this has completed successfully, then email the user to say the details have been added successfully to the database.

I need to:

1. Check that the relevant data has been added into the database then

2. Email the details of the relevant data when completed. 

 

Thanks in advance for your help,

Laura

 

 


The type 'System.Data.Linq.DataContext' is defined in an assembly that is not referenced. You must

  

Hi,

This is frustrating, and I don't know how to solve it.

I have a strange problem. I am adding a LinqDatasource object, and set the context:

        protected void LinqDataSource_ContextCreating(object sender, LinqDataSourceContextEventArgs e)
        {
            e.ObjectInstance = new KaruselaDataContext(ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString);
        }


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?

Thanks.


MySql.Data assembly problem

  

Hi,

I added refernece MySql.Data to my project. My web.config looks like that:

<?xml version="1.0"?>
<configuration>
    <connectionStrings>
    </connectionStrings>
    <system.web>
        <compilation>
            <assemblies>
                <add assembly="MySql.Data, Version=6.1.4.0, Culture=neutral, PublicKeyToken=C5687FC88969C44D"/>
            </assemblies>
    </compilation></system.web></configuration>


But when in ServerExplorer I try "Add Connection..." I can't find "MySql Database" in the "Choose Data Source" dialog box?


What the problem can be?





Data Points: LINQ Projection Queries and Alternatives in WCF Services

  

LINQ's ability to project randomly shaped data into anonymous types can be a blessing and a source of frustration, says Julie Lerman. It's great when you just need to grab a special view of your data, but it can be problematic in certain circumstances. She explains what the limitations are and how to get around them.

Julie Lerman

MSDN Magazine May 2010


Data Points: Precompiling LINQ Queries

  

Did you know that by precompiling LINQ queries you might actually be degrading your app's performance if you're not careful? Julie Lerman explains how to ensure you're not re-precompiling queries each time and losing the expected performance benefits across post-backs, short-lived service operations and other code where critical instances are going out of scope.

Julie Lerman

MSDN Magazine March 2010


SOA Data Access: Flexible Data Access With LINQ To SQL And The Entity Framework

  

Building a data access layer using LINQ to SQL and the ADO.NET Entity Framework allows you to decouple your application from the persistence technology you're using.

Anthony Sneed

MSDN Magazine December 2008


Data Points: Standard Query Operators with LINQ

  

LINQ to Objects and LINQ to Entities have an arsenal of Standard Query Operators that operate on sequences to perform a wide variety of operations.

John Papa

MSDN Magazine March 2008


problem...i want a list item to populate all data in gridview!!!

  

i have a dropdownbox and a gridview

what I want is to have a list item which populates all data in a gridview.

I have tried using list item selected value=0 but to no avail.

what is the easiest way to achieve this?


Linq getting data from field on record

  

Hello,

   I would assume this is possiable but I cannot seem to find it anywhere. I just one the contents of a single field, I don't see why I have to return the how

record to get get that information, here is my current code, how can I make this better without returning the entire record, for just getting contents of one field.


var patternrecord = storedb.Patterns_Table.Single(a => a.Pattern_GUID == id);
PMEDIA.Pattern_Key = patternrecord.Pattern_Key;


Linq join fields for return data

  

Hello,
  how would I join fields together?

           return (from c in storedb.Product_Categories

                         where c.Category_Name.Contains(searchText)
                         orderby c.Category_Name
                         select new {
                                    c.Cat_GUID,
                                    c.Category_Key && " ;" && c.Category_Name // HOW CAN I DO THIS.....
                          

Quick Note: Create Silverlight Graphs with SharePoint 2010 Data by Using LINQ

  
In this exercise, you will learn how to create Silverlight applications to retrieve SharePoint 2010 list data using LINQ.

Quick Note: Accessing Data in a SharePoint 2010 Web Part by using LINQ

  
In this exercise, you develop and deploy a visual Web Part that reads data from two lists by using a LINQ query and displays it in a DataGrid control.

LINQ query with multiple joins, problem

  

I am using a LINQ query with multiple joins, the last join does not return any values even though values exist in the database. Below is my code.

when the query returns suiteNameTrg and SuiteTypeTrg are empty, all other values are returned correctly.

string suiteNameTrg = string.Empty;
            string suiteTypeTrg = string.Empty;
            using (DataClassesDataContext db = new DataClassesDataContext())
            {  
                    var productQuery = from assets in db.ASSETs
                    join relocatableUnits in db.RELOCATABLE_UNITs on assets.RUID equals relocatableUnits.RUID into assets_units
                    from relocatableUnits in assets_units.DefaultIfEmpty()
                   join build in db.BUILDINGs on assets.BUILDING_ID equals build.BUILDING_ID into assets_bins
                   from build in assets_bins.DefaultIfEmpty()
                   join test in db.TEST_SUITEs on assets.TEST_SUITE_ID equals test.TEST_SUITE_ID into test_bins
                   from test in test_bins.DefaultIfEmpty()
                    
                    join testTrgt in db.TEST_SUITEs on assets.TARGET_TEST_SUITE_ID equals testTrgt.TEST_SUITE_ID into testTrgt_bins
                    from testTrgt in testTrgt_bins.DefaultIfEmpty()

                    select new
                                   {
                          
Categories: 
ASP.NetWindows Application  .NET Framework  C#  VB.Net  ADO.Net  
Sql Server  SharePoint  Silverlight  Others  All   

Hall of Fame    Twitter   Terms of Service    Privacy Policy    Contact Us    Archives   Tell A Friend