Now when the user select item from the droplist i want to populate the 2nd droplist according to the item that was selected, but its not working. SqlCommand cmd = new SqlCommand("SELECT DomainId, DomainName FROM Domain",conn) ĭropDownList1.DataTextField = "DomainName" ĭropDownList1.DataValueField = "DomainId" ĭropDownList1.DataSource = cmd.ExecuteReader() I populate the 1st droplist with data from domain (im using DomainId as datavalue and DomainName as datatext/ here is the code: protected void Page_Load(object sender, EventArgs e) in the subDomain table i have foreign key to the column DomainId in domain table. in the DB i have domain table and subDomain table.
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