CODEWITHSUNDEEP
c#asp.net
Stev
Stev

Reputation: 307

Server Error: DropDownList not allowed multiple selections

I have two DropDownLists and I'm adding Items like this:

using (SqlDataReader reader = command.ExecuteReader())
{
    ddUserTarget.Items.Add(new ListItem(" ", "empty534534545"));
    while (reader.Read())
    {
        ddUsersSource.Items.Add(new ListItem(reader[1].ToString(), reader[0].ToString()));
        ddUserTarget.Items.Add(new ListItem(reader[1].ToString(), reader[0].ToString()));
    }
}

When I'm use one of this DropDownList after a button click or a autopostback there are this HttpException:

In the DropDownList it's not allowed to select more than one item. (0x80004005)

If I delete this line, the error will not appear:

ddUserTarget.Items.Add(new ListItem(" ","empty534534545"));

The error is triggered at this position:

else if (ddUserTarget.SelectedValue == "test")

I really dont know what to do now....

Upvotes: 0

Views: 243

Answers (2)

Ajay
Ajay

Reputation: 6590

Try this. In while loop you are inserting same Items twice. 

        using (SqlDataReader reader = command.ExecuteReader())
        {
            ddUserTarget.Items.Insert(0,new ListItem("empty534534545"));
            while (reader.Read())
            {
                ddUsersSource.Items.Insert(ddUsersSource.Items.Count,new ListItem(reader[1].ToString(), reader[0].ToString()));                
            }
        }

Upvotes: 0

Scription
Scription

Reputation: 645

Probably you are setting a value to "SelectedItem" in more than one place. I suggest you clear the selected items before post back (at the page end). for example:

DropDownList myDDL = new DropDownList();
myDDL.ClearSelection();

Upvotes: 2

Related Questions