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hello Everyone,
I have 2 drop downlists and a file upload button. When i browse the file and click on the upload button the drop ownlist selected value disappears.please help to fix this issue.
Dr Drastic 14-Jul-14 5:17am
Could you post some code then we can have a look at where your problem could be
Dilan Shaminda 14-Jul-14 5:21am
have you set ViewStateMode="Enabled" for your Dropdownlists?
Raje_ 14-Jul-14 5:23am
Can you please add EnableViewState="true" to your Page directive and then check if it works.
Member 10578683 14-Jul-14 5:23am
jo.him1988 14-Jul-14 5:35am
can you post your source view of page here ,make sure about value property of drop down list
Member 10578683 14-Jul-14 5:41am
public void BindCName()
string qry = "select distinct Customer_Name from Customer_Details";
DataSet ds = du.GetDataSet(qry);
ddlCName.DataSource = ds;
ddlCName.DataTextField = "Customer_Name";
ddlCName.DataValueField = "Customer_Name";
ddlCName.Items.Insert(0, "<--Select-->");
ddlCName.Items[0].Value = "";

public void BindCLocation()
string qry = "select distinct Customer_Location from Customer_Details";
DataSet ds = du.GetDataSet(qry);
ddlCLocation.DataSource = ds;
ddlCLocation.DataTextField = "Customer_Location";
ddlCLocation.DataValueField = "Customer_Location";
ddlCLocation.Items.Insert(0, "<--Select-->");
ddlCLocation.Items[0].Value = "";

Member 10578683 14-Jul-14 7:43am
<td class="style107" valign="top" colspan="2">

<asp:DropDownList ID="ddlCName" runat="server" AutoPostBack="true"
OnSelectedIndexChanged="ddlCName_SelectedIndexChanged" CssClass="style168"
Height="30px" Width="150px" BackColor="White" Font-Size="8.5pt" ViewStateMode="Enabled">

<td class="style160" valign="top">
<asp:Label ID="lblH3" runat="server" Text="Customer Location" CssClass="style169"
Font-Size="8.5pt" ForeColor="Black">
<td class="style162" valign="top" colspan="2">

<asp:DropDownList ID="ddlCLocation" runat="server" CssClass="style168"
Height="30px" Width="150px" BackColor="White" Font-Size="8.5pt" ViewStateMode="Enabled" >
jo.him1988 14-Jul-14 7:31am
ohh, here i was talking about your design source VIEW, any way i am not getting any error to get value disappear kind of error
let me guess you call these method on page on load event with check page.ispostback property,
now is auto post back property is true for both dropdown list than set enableviewstate to true
make sure page load you have mention ispostback pro of page
Member 10578683 14-Jul-14 7:55am
yes i am calling these methods in page load as follows
if (!Page.IsPostBack)
//GridView1.Visible = false;
//lblCurrentDate.Text = DateTime.Now.ToString();

Enable view state for dropdown.
Nirav Prabtani 14-Jul-14 5:26am
my 5+
Member 10578683 14-Jul-14 5:40am
ya i enabled view state still it is notworking
if you takes both dropdown in a update panel will prevent from postback of upload button

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