Solved

DrownDownList

Posted on 2011-02-24
6
314 Views
Last Modified: 2012-05-11
I am populating a dropdowlist in an asp.net 4.0 form as follows. when I select any item other than the first or second item, it returns to the first item after postback and selectindexchanged event doesn't work. how can I fix the error?


    protected void Page_Load(object sender, EventArgs e)
    {
        if (!Page.IsPostBack)
        {
            bindPartrs();
        }
    }

    void bindPartrs()
    {
        string connString = System.Configuration.ConfigurationManager.ConnectionStrings["WMSConnectionString"].ConnectionString;
        SqlConnection cn = new SqlConnection(connString);

        SqlCommand cmd = new SqlCommand("getParts", cn);
        cmd.CommandType = CommandType.StoredProcedure;
        cn.Open();

        DataSet ds = new DataSet();
        SqlDataAdapter da = new SqlDataAdapter();

        da.SelectCommand = cmd;
        da.Fill(ds);

        cboPartno.DataSource = ds;
        cboPartno.DataTextField = "PartNo";
        cboPartno.DataValueField = "partInfo";
        cboPartno.DataBind();
        cboPartno.Items.Insert(0, new ListItem("---", ""));
    }

    protected void cboPartno_SelectedIndexChanged(object sender, EventArgs e)
    {
 if (cboPartno.SelectedIndex != 0)
        {
            string[] myArray2;

            myArray2 = cboPartno.SelectedValue.Split('|');

            lblPartName.Text = myArray2[0];
            lblCategory.Text = myArray2[1];
            lblModel.Text = myArray2[3];
        }
        else
        {
            lblPartName.Text = string.Empty;
            lblCategory.Text = string.Empty;
            lblModel.Text = string.Empty;
        }
    }

Open in new window


thanks

ayha
0
Comment
Question by:ayha1999
  • 3
  • 3
6 Comments
 
LVL 52

Expert Comment

by:Carl Tawn
ID: 34973790
Can you post the definition (markup) for your dropdownlist, and also the output (view source) when the page is running?
0
 
LVL 7

Author Comment

by:ayha1999
ID: 34973856
 
markup:

  <asp:DropDownList ID="cboPartno" runat="server" AutoPostBack="True" 
        onselectedindexchanged="cboPartno_SelectedIndexChanged" ViewStateMode="Inherit">
    </asp:DropDownList>
                            <asp:Label ID="lblPartName" runat="server" 
                                style="font-weight: 700; color: #0000CC;"></asp:Label>
                            <asp:Label ID="lblCategory" runat="server" 
                                style="font-weight: 700; color: #0000CC;"></asp:Label>
                               <asp:Label ID="lblModel" runat="server" 
                                style="font-weight: 700; color: #0000CC;"></asp:Label>


view source:

<select name="ctl00$ctl00$MainContent$ContentPlaceHolder1$cboPartno" onchange="javascript:setTimeout(&#39;__doPostBack(\&#39;ctl00$ctl00$MainContent$ContentPlaceHolder1$cboPartno\&#39;,\&#39;\&#39;)&#39;, 0)" id="MainContent_ContentPlaceHolder1_cboPartno">
	<option value="">---</option>
	<option value="partame|Consumables|RG 11     |RG 11">A_1</option>
	<option selected="selected" value="partame10|Consumables|RG 11     |RG 11">A_10</option>
	<option value="partame|Consumables|RG 11     |RG 11">A_100</option>
	<option value="partame|Consumables|RG 11     |RG 11">A_1000</option>
	<option value="partame|Consumables|RG 11     |RG 11">A_1001</option>
	<option value="partame|Consumables|RG 11     |RG 11">A_1002</option>
...

Open in new window

0
 
LVL 52

Expert Comment

by:Carl Tawn
ID: 34973872
The problem is that most of your dropdownlist values are the same. They need to be unique otherwise the dropdown cannot distinguish which is which.
0
Master Your Team's Linux and Cloud Stack!

The average business loses $13.5M per year to ineffective training (per 1,000 employees). Keep ahead of the competition and combine in-person quality with online cost and flexibility by training with Linux Academy.

 
LVL 7

Author Comment

by:ayha1999
ID: 34973890
but the partno is unique and at least the selected part no should there in the ddl, right?

thanks
0
 
LVL 52

Accepted Solution

by:
Carl Tawn earned 350 total points
ID: 34973905
The partno might be unique, but that is only the display field. The one that matters is the DataValueField, which is the one that the DropDownList uses internally to uniquely identify each item in the list.
0
 
LVL 7

Author Closing Comment

by:ayha1999
ID: 34973992
you are right. I have only test values now but at the end the SP I added + partno, so every values become unique!

thank you very much for your support.

ayha
0

Featured Post

Master Your Team's Linux and Cloud Stack!

The average business loses $13.5M per year to ineffective training (per 1,000 employees). Keep ahead of the competition and combine in-person quality with online cost and flexibility by training with Linux Academy.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

This article is for Object-Oriented Programming (OOP) beginners. An Interface contains declarations of events, indexers, methods and/or properties. Any class which implements the Interface should provide the concrete implementation for each Inter…
Today I had a very interesting conundrum that had to get solved quickly. Needless to say, it wasn't resolved quickly because when we needed it we were very rushed, but as soon as the conference call was over and I took a step back I saw the correct …
In a recent question (https://www.experts-exchange.com/questions/28997919/Pagination-in-Adobe-Acrobat.html) here at Experts Exchange, a member asked how to add page numbers to a PDF file using Adobe Acrobat XI Pro. This short video Micro Tutorial sh…
Established in 1997, Technology Architects has become one of the most reputable technology solutions companies in the country. TA have been providing businesses with cost effective state-of-the-art solutions and unparalleled service that is designed…

816 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

13 Experts available now in Live!

Get 1:1 Help Now