Dropdown list selected value disappears on postback

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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.

Posted 13-Jul-14 23:13pm

Member 10578683

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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

no

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.DataBind();
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.DataBind();
ddlCLocation.Items.Insert(0, "<--Select-->");
ddlCLocation.Items[0].Value = "";

}

Member 10578683 14-Jul-14 7:43am

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();
BindCName();
BindCLocation();
}

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ArunRajendra · Answer 1 · 2014-07-13T23:23:00

Solution 2

Enable view state for dropdown.

Posted 13-Jul-14 23:23pm

ArunRajendra

Comments

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

sushil7350 · Answer 2 · 2014-07-13T23:23:00

Solution 1

if you takes both dropdown in a update panel ..it will prevent from postback of upload button

Posted 13-Jul-14 23:23pm

sushil7350