ADO.NET :: How To Read Data From Database
Feb 23, 2011I am uisng asp.net 3.5 with c# as language. I want to read the database and store the data in either array or arraylist so that it can be called further in a dropdown list.
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In my page (ASP.NET/VB.NET) I have a dropdown box which is filled with Customer Names. No Problem there. However, when I choose the customer, the rest of the form is supposed to fill with data retreived from the database. If I choose original data, it works fine. However, as soon as I choose a newly added record. It throws the Exception. I have tried to find a solution online, but most answers point to missing read code. I think my code is right, as it reads some records correctly. Is there something that is wrong with my server, or the way I am writing the records?
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OnSelectedIndexChanged runs the following code:
sub displaydata(s as Object,e As EventArgs)
locked.checked = "True"
edit.enabled = "False"
Dim CustomerName As String = CNAME.SelectedItem.Text
Dim dread as SqlDataReader
Dim cn As New SqlConnection()
Dim cd As New SqlCommand()
cn.ConnectionString = "Data Source=localhost;Initial Catalog=AnalyticalReports;Integrated Security=True;"
cd.Connection = cn
cd.CommandText = "select Customers.CID, Customers.CNAME, Customers.CADDRESS1, Customers.CCITY, Customers.CSTATE, Customers.CZIP, Customers.CCONTACT, ISNULL(Contacts.CONNAME,'none') AS CONNAME FROM Customers JOIN Contacts ON Customers.CCONTACT = Contacts.CONID
WHERE Customers.CNAME = '"+ CustomerName+"'"
cn.Open()
dread = cd.ExecuteReader()
dread.Read()
CID.Text = dread("CID")
CNAME2.Text = dread("CNAME")
CADDRESS1.Text = dread("CADDRESS1")
CCITY.Text = dread("CCITY")
CSTATE.Text = dread("CSTATE")
CZIP.Text = dread("CZIP")
CONNAME.Text = dread("CONNAME")
cn.Close()
dread.close()
End Sub
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[Code]....
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[Code]....
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[Code]....
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