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

techques asked
Last Modified: 2013-12-17

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();
                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";
                this.currency.DataBind(); //throw exception
            catch (Exception e)
                string r = e.ToString();

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yes, it is working

this.currency.DataSource = ds.Tables[0].DefaultView;
            this.currency.DataTextField = "id";
            this.currency.DataValueField = "id";

ten check whether you are getting data in currency filed
may be it is returning null data so it having problems


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.


I found the error caused by the sequence of the function executed in page load.

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