SelectedValue which is invalid because it does not exist in the list of items.\r\nParameter name: value" string

Hi

I use the following code to bind data in a drop down list in a aspx with c#, but it throws error:

Message      "'currency' has a SelectedValue which is invalid because it does not exist in the list of items.\r\nParameter name: value"      string

How should I fix it?
<asp:DropDownList Runat="server" ID="currency" CssClass="form" Width=60  />
 
private void Bind_Currency()
        {
            string strSql = "SELECT id,currency from currency order by id";
            DataSet ds = new DataSet();
            try
            {
                ds = SqlHelper.ExecuteDataset(DBConnection.ConnString, CommandType.Text, strSql);
            }
            catch (Exception)
            {
                Response.Redirect("../error.aspx", true);
            }
            this.currency.DataSource = ds.Tables[0].DefaultView;
            this.currency.DataTextField = "currency";
            this.currency.DataValueField = "currency";
            try
            {
                this.currency.DataBind(); //throw exception
            }
            catch (Exception e)
            {
                string r = e.ToString();
            }
        }

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techquesAsked:
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Pratima PharandeConnect With a Mentor Commented:
is it working

 this.currency.DataSource = ds.Tables[0].DefaultView;
            this.currency.DataTextField = "id";
            this.currency.DataValueField = "id";
0
 
techquesAuthor Commented:
yes, it is working

this.currency.DataSource = ds.Tables[0].DefaultView;
            this.currency.DataTextField = "id";
            this.currency.DataValueField = "id";
0
 
Pratima PharandeCommented:
ten check whether you are getting data in currency filed
may be it is returning null data so it having problems
0
 
techquesAuthor Commented:
it is very strange

i added break point to view it line by line

this.currency.DataTextField = "currency";
this.currency.DataValueField = "currency";

They can get value in first time of loading, but I do not know why it loads the 2nd time and it became null.

0
 
techquesAuthor Commented:
I found the error caused by the sequence of the function executed in page load.
0
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