dropdownlist selected item return wrong index

rick

I have a WebForm application with a dropdownlist. The datasource for the dropdown is a DataTable with 4 item. The DataTable is built in codebehind.

DataTable rn = new DataTable();

rn.Columns.AddRange(new DataColumn[2]);

rn.Columns.Add(new DataColumn("command", typeof(string)));

rn.Columns.Add(new DataColumn("url", typeof(string)));

DataRow dr;

dr = rn.NewRow();

dr["command"] = "Update Page";

dr["url"] = "~/MX/MXEntities.aspx";

rn.Rows.Add(dr); 3 more just like this

Each item has 2 columns. The dropdown displays correctly however when selecting the first or second item, index of 0 is always returned. Items 3 or 4 always returns index of 2.

string index = allTable.SelectedIndex.ToString();

string selectedvalue = allTable.SelectedItem.Value;

string selectedtext = allTable.SelectedItem.Text;

Got to be something really stupid but I sure can't see it.

3 Replies

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Vincent Maverick Durano6y ago
That is correct. DropDownList values shoule be unique so your selection will work properly.
rick6y ago
Sorry to have bother you with this. Turns out that that it didn't like have the same value in two different items.
go figure.
Vincent Maverick Durano6y ago
Two things:

1. If you are populating your DropDownList on Page_Load event, make sure that you wrap your code for binding within Not IsPostback block.

2. Make sure that your DropDownList Value field doesn't contain any duplicate data. DataValueField should be unique.