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

Top 5 Contributors of the Month
david stephan
Gaurav Pal
Post New Web Links

How to bind distinct values to DropDownList from DataSet (as a result of a web service call)?

Posted By:      Posted Date: October 07, 2010    Points: 0   Category :ASP.Net

Hi there,

I'm trying to bind a dataset (where the data is coming from a webservice) to a dropdownlist; the problem is that I'm getting duplicates in the list... how can I display distinct values only:

drp_Brand.DataSource = ds.Tables[0];
            drp_Brand.DataTextField = "Brand";
            drp_Brand.DataValueField = "Brand";



View Complete Post

More Related Resource Links

how to bind Dropdownlist based on textbox values



I have one drodownlist which show data based om textbox values...

Let us consider i have 

Select Name from table1 where Type IN(@typ)

here @typ is textbox values

here for example textbox will have some thing like this L1,L2,L3..

How to filter Name based and shown in drodownlist based on this L1,L2,L3(on textbox)..

Help me in this

bind values to dropdownlist using ASP.NET MVC



I'm using asp.net MVC 2.0, my controller coding is,

foreach(DataColumn dc in dtImport.Columns)


TempData["drpsku"] = dc.ColumnName.ToString();


i need to bind this value to the drpdown list in the aspx page.

<asp:DropDownList ID="DropDownList1" runat="server"></asp

jQuery's ajax to call web service that returns ado.net dataset to xml



     I try to use jQuery ajax to call web service that returns ado.net dataset which writes to xml, and after I get result client side, I will append to ol tag.

     It did not make it at the time of get result and try to loop the table tag.

     Thank you,





******* WebServiceCommon.cs    

    [ScriptMethod(ResponseFormat = ResponseFormat.Xml)]
    public string GetAllLabsInXML()
        DataSet m_dsDataSet = new DataSet("pageDataSet");
        string m_szSQLConn = "Data Source=(local);Initial Catalog=abc;Integrated Security=False;uid=sa;pwd=abc;Pooling=false;";
        string _szSQL = @"Select LabID, Description From Lab";
        SqlConnection _objConn = new SqlConnection(m_szSQLConn);
        SqlDataAdapter _objDA = new SqlDataAdapter(_szSQL, _objConn);

        MemoryStream ms = new MemoryStream();
        m_dsDataSet.WriteXml(ms, XmlWriteMode.IgnoreSchema); 
        StreamReader sr = new StreamReader(ms, System.Text.Encoding.UTF8); 
        ms.Position = 0;
        String strXml = sr.ReadToEnd(); 

        return s

How to bind GridView and DropDownList controls using DataTable object

In .net framework 2.0, you can load a DataTable in memory by consuming a data source using a DataReader. In this version you will find the flexibility in accessing the DataReader means write access code once and use again and again using DataReader. To see the functionality of DataTable consider an example that is created using VS2005.

How to bind TemplateField DropDownList with ArrayList?


Hi Expert!

  I'm trying gridview templateField DropDownList bind with arraylist. When i set bindsource i got this error. "//Error Object reference not set to an instance of an object."

My Sample .aspx

<asp:TemplateField HeaderText="Type">
                        <asp:DropDownList ID="_grvcboType" runat="server" Width="117px" DataTextField="Display" DataValueField="Value">
                        <asp:Label ID="Label7" runat="ser

reading the result of a web service (XML)


Hi all,

I registered for a service that returns me the geolocation of the visitor and i process it in my exe application (c#).

But i dont know how to read that data in cs?

Here is the link that i send : 


and returning page content ;  

<?xml version="1.0" encoding="UTF-8" ?>
  <provider>Turk Telekom</provider>

Include a Crystal Report in .NET Web Service for Dynamic In-Memory-Only DataSet



I would like to use Crystal Reports in a .NET web service.  Ultimately I would like to convert my report document to a PDF and then return the PDF as a byte array. 

My .NET DataSet is generated dynamically at run-time.  It consists of four related tables.  Since my DataSet does not have a physical datasource, I created an XML Schema file.  I then added the XML Schema file to the web service project with Add Existing Item. 

A solution for working with a dynamic in-memory DataSet exists for ASP.NET web sites and client-based forms.  I tried to use this method as it is published.  When that didn't work I tried creating the report and XML Schema directly in the web service project, but that also didn't work.


The problem is apparent when you try to set the datasource.......the code bombs on the call to SetDataSource(DataSet) with the message
ex = {"The data source object is invalid."}

Crystal Reports would save me a lot

Invalid web service call, missing value for parameter: \u0027prefixo\u0027 (AutoCompleteExtender)


Good afternoon.

I'm trying to put an AutoCompleteExtender working, but i'm having an error, that i discovered with Fiddler, that is the reason that the autocomplete doesn't work:

> **{"Message":"Invalid web service call,
> missing value for parameter:
> \u0027prefixo\u0027."**,"StackTrace":"
> at
> System.Web.Script.Services.WebServiceMethodData.CallMethod(Object
> target, IDictionary`2 parameters)\r\n
> at
> System.Web.Script.Services.WebServiceMethodData.CallMethodFromRawParams(Object
> target, IDictionary`2 parameters)\r\n
> at
> System.Web.Script.Services.RestHandler.InvokeMethod(HttpContext
> context, WebServiceMethodData
> methodData, IDictionary`2
> rawParams)\r\n at
> System.Web.Script.Services.RestHandler.ExecuteWebServiceCall(HttpContext
> context, WebServiceMethodData
> methodData)","ExceptionType":"System.InvalidOperationException"}

This is the webservice code:

    Imports System.Web.Services
    Imports System.Web.Services.Protocols
    Imports System.ComponentModel
    Imports GcpBE750
    Imports ErpBS750
    Imports StdBE750
    ' To allow this Web Service to be called fro

PredictCaseLikelihood - strange result for a simple dataset

Hi, I have a some numbers between 1 and 431 and I want to use PredictCaseLikelyHood to determine the chances that any new number is a valid member of the existing set. My current dataset looks like this: 1 1 1 2 3 3 3 3 4 5 5 6 7 8 10 10 10 10 11 11 12 13 15 15 20 20 20 20 20 20 20 20 20 20 20 22 25 25 25 25 27 30 30 30 30 35 40 40 42 45 45 50 50 50 50 50 50 50 50 50 50 50 58 60 73 80 80 89 90 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 116 140 155 155 200 431   I use clustering to train the model with no holdout set. And I use the Mining Model Prediction Tab to test the PredictCaseLikelihood (normalized) result with a singleton query. As expected, when I enter new numbers between 1 and 431 the returned probability by PredictCaseLikelihood is very high (approx 0.99), however, when I enter positive outliers like 2000, the likelihood is INCREASED to 1, and if I give 2500 and above the likelihood is NaN. Any idea what is causing this strange behaviour? Is my dataset not fit for clustering and in that case why? I use SSAS 2008.   Thanks for any advice, Jørgen      

Trying to call an asmx web service from a test project

I am trying to create a proxy for an asmx web service. The only thing I find in Visual Studio 2008 is a service reference. How do I call an asmx web service with a service reference? Certified Geek. Professional Data dude.

Unable to call an asmx web service using windows authentication from a Service workflow

Hello, I need to use an existing asmx service from inside my service workflow and I am unable to call it. This asmx service is hosted in a web application with iis set to windows authentication, anonymous is not allowed. I need to send the authentication, only way seems too be using transport for basicHttpBindings. Every time I try to call the service I get an error saying that there is nothing listening to the url of the service generated automatically by VS when I added the Service Reference ? my web config <configuration> <configSections> </configSections> <system.web> <compilation debug="true" targetFramework="4.0" /> </system.web> <system.serviceModel> <protocolMapping> <add scheme="http" binding="wsHttpBinding" bindingConfiguration="WindowsCreds" /> </protocolMapping> <bindings> <basicHttpBinding> <binding name="UtilitiesSoap" closeTimeout="00:01:00" openTimeout="00:01:00" receiveTimeout="00:10:00" sendTimeout="00:01:00" allowCookies="false" bypassProxyOnLocal="false" hostNameComparisonMode="StrongWildcard" maxBufferSize="65536" maxBufferPoolSize="524288" maxReceivedMessageSize="65536"

DropDownList to display values from Two Tables - bold sub heading and normal Text

Hello I hope I am not asking simple one.  SUPPORT SERVICES<     Computing Service    Library or Data Engineering    Civil Engineering    Electrical Engineering  I have the data to display in a DropDownList control shown as above. There is a distinct category Type(example Support Services) and Category Name i.e., Computing Services. I do not want to hard code the values into DropDownList control. I like to get the data from database to display as shown in above Table. Note that Category Type should be displayed in Bold and Category Name in normal Text. Question: In order to achieve the above, 1. How many database Tables and relationships between them  2. Query the data to display in the above format in drop down 3. how should be the code behind i.e, DataTextValue and DataValueField for DropDownList. Please provide with useful code snippets or references. Thanks,

Accessing a row's dropdownlist values AFTER the gridview control is in Edit mode

Hello, I have a gridview control. When it goes into Edit mode, there are 3 dropdownlists in one cell that are populated by separate stored procedures during the RowDataBound event. The 1st dropdownlist's value is used as a parameter to determine what the 2nd dropdownlist is populated with. The 2nd dropdownlist's value is used as a parameter to determine what the 3rd dropdownlist is populated with. Everything works fine when the row is first put into Edit mode. While I'm in Edit mode and I change the selection in the 1st dropdownlist, how do I access the control so I can feed this new parameter to the 2nd dropdownlist? I have the first 2 dropdownlists set for AutoPostBack so that the Page_Load event is fired when the user changes a value. I know how to get access to these controls via the FindControl method when the row is being databound but how do I find the control during the Page_Load event? Thanks for any help!!!   Penny  

Need to add hard coded values to LINQ query result

I am running a LINQ query which populates a list used by a DropDownList, I need to insert an "Unassigned" value to the list. The function below queries the values correctly from the db but does not insert the "Unaasinged" value to the list. Please help.   public List<KeyValuePair<int, string>> GetTestList() { KeyValuePair<int, string> item = new KeyValuePair<int, string>(0, "Unassigned"); using (DataClassesDataContext db = new DataClassesDataContext()) { var Query = from records in db.TEST_SUITEs orderby records.TEST_SUITE_ID select new KeyValuePair<int, string> ( records.TEST_SUITE_ID, string.Format(records.TEST_SUITE_ID + " " + records.SUITE_TYPE + " " + records.SUITE_NAME) ); //Query.ToList().Insert(0, item); Query.ToList().Insert(0,item); return Query.ToList(); } }  

SharePoint ASPX Web Service Call Error

I have developed an ASPX page using VS2005. This page simply queries a SharePoint list through a WSS web service using CAML and takes the results and populates a DataTable and binds it to a DataView. The code works perfect using VS2005 but when I port it over to SharePoint I get the following error.Description: The application attempted to perform an operation not allowed by the security policy.  To grant this application the required permission please contact your system administrator or change the application's trust level in the configuration file. Exception Details: System.Security.SecurityException: Request for the permission of type 'System.Security.Permissions.SecurityPermission, mscorlib, Version=, Culture=neutral, PublicKeyToken=b77a5c561934e089' failed.The call stack is as follows:[SecurityException: Request for the permission of type 'System.Security.Permissions.SecurityPermission, mscorlib, Version=, Culture=neutral, PublicKeyToken=b77a5c561934e089' failed.]   System.Security.CodeAccessSecurityEngine.CheckNReturnSO(PermissionToken permToken, CodeAccessPermission demand, StackCrawlMark& stackMark, Int32 unrestrictedOverride, Int32 create) +0   System.Security.CodeAccessSecurityEngine.Assert(CodeAccessPermission cap, StackCrawlMark& stackMark) +79   System.Security.CodeAccessPermission.Assert() +37   Book2Physical.Requests.get_DataSource() +

Binding Web Service Result in asp:gridview and enable sorting(paiging)

Hello everyoneI have web service and gridviewI'm binding it without problemcode: protected void Page_Load(object sender, EventArgs e) { GetCallsService wservice = new GetCallsService(); List<Call> list = wservice.getCalls(2); GridView1.DataSource = list; //GridView1.AllowSorting = true; GridView1.DataBind(); } But I want to enable sorting and(or) paging.   GridView1.AllowSorting = true; this doen't solves problem.everything worls fine if I'm usign sqlDatasource but when datasource is web service it doesn't wokdoes enyone know solution?
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