SelectedValue which is invalid because it does not exist in the list of items

Question

I encounter this problem repeatedly, and haven\'t a clue what is causing it. I get an exception in the DataBind: SelectedValue which is invalid because it does not exist i

Answer 1

I was getting the same error repeatedly and try ending up by not setting the default selected value to Index -1.

I commented my code ddlDRIBidAmt.SelectedValue = -1

This value was set at the time where my Page Controls were reset to default values.

Answer 2

Apparently the solution I posted wasn't entirely effective... Eventually in my application I changed to this:

listOrgs.Items.Clear();
listOrgs.SelectedIndex = -1;
listOrgs.SelectedValue = null;
listOrgs.ClearSelection();     // Clears the selection to avoid the exception (only one of these should be enough but in my application I needed all..)
listOrgs.DataSource = new Organization().DTListAll(SiteID);
listOrgs.DataTextField = "OrganizationName"; 
listOrgs.DataValueField = "OrganizationID"; 
listOrgs.DataBind();

Answer 3

I know its too late to answer, but what I tried is an dirty solution but it worked. After databinding, I am insert a item at index 0

ddl.Items.Insert(0, new ListItem("---Select---","-1"));

And on setting,

I am placing try catch, In catch i am setting Value to -1