Dropdown list not selecting value asp.net

Question

  ddlBanAcc.Items.Insert(0, new ListItem("", ""));
  string s = ddlBanAcc.SelectedValue;
  string[] words = s.Split('|');
  if (ddlBanAcc.SelectedIndex > 1)
  {
    query += "'and DtaLineAccountToDebit='" + words[0] + "'";
  }

On the ddlBankAcc (Dropdownlist selection) i am populating the Datagrid which is in the Update Panel

However the code is not executing and no value is getting selected by this statement ddlBanAcc.SelectedValue;

EDIT: HTML CODE

<td align="left" valign="top">
                            &nbsp;</td>
                 <td>
                            Bank Account:
                        </td>
                        <td>
 <asp:DropDownList runat="server" ID="ddlBanAcc" Width="160px" TaEvalex="3">
    </asp:DropDownList>

                        </td>

EDIT : how i am adding data in ddlBanAcc

DataTable dtbankaccount = oDBAccess.getDataTable("SELECT BkiAccountNb + ' | ' + BkiCurrency+ ' | ' +BkiAccountNb AS CONCATE  From VwCieBankAcc");
    ddlBanAcc.DataTextField = "CONCATE";
    ddlBanAcc.DataSource = dtbankaccount;

    ddlBanAcc.DataBind();

paste some more code from HTML section too so that we can go for solutions............ — Ram Singh
– Ram Singh, Commented Oct 11, 2012 at 4:46
Have you selected an item in ddlBanAcc ? If you dont s.Split will fail. — abhishek
– abhishek, Commented Oct 11, 2012 at 4:49

Aristos · Accepted Answer · 2012-10-11 06:34:21Z

11

You need to check IsPostBack, and if it is do not make DataBind, because this is making the DropDownList to re-get all his values, and lost the selection.

if(!IsPostBack)
    ddlBanAcc.DataBind();

Especial on DropDownList that is keep his values on ViewState you need to use the IsPostBack to the full process that is fill in. And the final code will be:

if(!IsPostBack)
{
    DataTable dtbankaccount = oDBAccess.getDataTable("SELECT BkiAccountNb + ' | ' + BkiCurrency+ ' | ' +BkiAccountNb AS CONCATE  From VwCieBankAcc");
    ddlBanAcc.DataTextField = "CONCATE";
    ddlBanAcc.DataSource = dtbankaccount;

    ddlBanAcc.DataBind();
}

If for any other reason you need to make DataBind and change the content of the DropDownList even after his selection you can always get the post back value using the Request.Form as:

Request.Form[DromDownListID.UniqueID]

edited Oct 11, 2012 at 6:34

answered Oct 11, 2012 at 5:44

Aristos

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Comments

Anirudh Agarwal · Accepted Answer · 2012-10-11 04:50:30Z

3

    <asp:DropDownList ID="ddlBanAcc" runat="server" DataTextField="" DataValueField="">
    </asp:DropDownList>

Try defining the DataTextField and DataValueField in the back end. This should help.

answered Oct 11, 2012 at 4:50

Anirudh Agarwal

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9 Comments

Anirudh Agarwal Over a year ago

Give your respective DataTextField and DataValueField

Anirudh Agarwal Over a year ago

Yes have seen try giving DataValueField also

vini Over a year ago

i cant specify a DataValue field as in am concatenating the values and no specific column is being used to populate the Dropdownlist

Anirudh Agarwal Over a year ago

For you using SelectedValue. So you need to have DataFieldValue

vini Over a year ago

I have specified CONCATE as my DataValueField it still doesnt work

|

nick_w · Accepted Answer · 2012-10-11 04:52:55Z

1

You'll need to add AutoPostBack="true" to your DropDownList to get it to post back. I presume this is why the code is not executing.

answered Oct 11, 2012 at 4:52

nick_w

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1 Comment

vini Over a year ago

No still not getting any values

Oliver Lundt · Accepted Answer · 2015-04-01 03:54:09Z

0

There is one more surprising issue that can cause this! My list values came from a database and the values had linefeed and carriage return: "\r\n". These values look like an innocent space, but actually they are not! My solution was to remove these hidden Char values. Hope it helps.

answered Apr 1, 2015 at 3:54

Oliver Lundt

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