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ASP.NET DropDown List using the DataAdapter instead of a DataReader and finding the Selected index of data from Access Database

Posted on 2004-04-22
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Last Modified: 2008-03-06
Hello!
Ok, here's my problem:

I have two tables in the same database, for this example I'll call them table1 and table2. Table1 has all of the information in it and table2 is used only as a list to provide a value for a field in table1. I can create a dropdownlist showing all of the values in table2, but cannot get it to show the selected index of table1 for the value that's selected. Also, I can get the value that's selected in table1, but can't get the rest of the dropdown list (all the values in table2 EXCEPT the one that's selected) to show up. I am using the DataAdapter instead of the DataReader (which nearly all of the examples I've seen use) to retrieve the values in the list because I need to eventually be able to modify the list itself. Any ideas??

Here is my code for what I have (2 examples):

'----------------------------THIS CODE ONLY WILL SHOW ALL OF THE LIST FROM TABLE2 BUT NOT THE SELECTED INDEX FROM TABLE1------------
Dim oleConn As New OleDB.oleDbConnection()
oleConn.ConnectionString="Provider=Microsoft.Jet.OLEDB.4.0;data source=" & server.mappath("\db\prototype.mdb")

Dim oleComm AS NEW OleDb.oleDbCommand()

oleComm.Connection=oleConn

oleComm.CommandText="SELECT * FROM table2"

dim da as New OleDb.OleDbDataAdapter()
Dim ds as New DataSet()
da.selectCommand=Olecomm
da.Fill(ds,"Table2")

'---Hosp1 is the dropdownlist control
Hosp1.datasource=ds.Tables("Table2").DefaultView

oleConn.Close()
hosp1.databind()


'------------------------END EXAMPLE 1-----------------------------------------


'----------------------------THIS CODE ONLY WILL SHOW THE CORRECT SELECTED INDEX FROM TABLE1 , BUT NOT THE REST OF THE LIST FROM TABLE2------------
Dim oleConn As New OleDB.oleDbConnection()
oleConn.ConnectionString="Provider=Microsoft.Jet.OLEDB.4.0;data source=" & server.mappath("\db\prototype.mdb")

Dim oleComm AS NEW OleDb.oleDbCommand()

oleComm.Connection=oleConn

'hosp.text is a value in table1 equal to value HospCode in Table2
oleComm.CommandText="SELECT * FROM Table2 WHERE Hospcode=" + Hosp.text

dim da as New OleDb.OleDbDataAdapter()
Dim ds as New DataSet()
da.selectCommand=Olecomm
da.Fill(ds,"table2")

'---Hosp1 is the dropdownlist control
Hosp1.datasource=ds.Tables("table2").DefaultView

oleConn.Close()
hosp1.databind()


'-----------------END EXAMPLE 2------------------------------


Thank you in advance!
Kittrick
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Question by:Kittrick
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4 Comments
 
LVL 6

Accepted Solution

by:
pillbug22 earned 350 total points
ID: 10892971
I think I understand what you need, so here's my guess:


dim tbl1SelectedValue as string = <value from table1 you are trying to slect in the list>
Hosp1.SelectedIndex = Hosp1.Items.IndexOf(Hosp1.Items.FindByValue(tbl1SelectedValue))

-or-

dim tbl1SelectedValue as string = <value from table1 you are trying to slect in the list>
Hosp1.SelectedIndex = Hosp1.Items.IndexOf(Hosp1.Items.FindByText(tbl1SelectedValue))
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LVL 4

Author Comment

by:Kittrick
ID: 10894787
Thank you pillbug for your reply! I can find the index, but not get that index to highlight the dropdownlist with all of the other choices in table2..it's just the index by itself. Is there something I'm doing wrong?? Did I not finish the list somehow?? Any suggestions?? Thanks!
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LVL 23

Assisted Solution

by:rama_krishna580
rama_krishna580 earned 150 total points
ID: 10895769
0
 
LVL 4

Author Comment

by:Kittrick
ID: 10905338
Thank you for your responses!

Here is how I solved the problem for everyone to see. My problem was that I could find the index checked in table2
and the proper value corresponding to it in table1, but couldn't get the proper selectedindex to show in the dropdownlist and all of the other list options to show from table2. Either the selectedindex ONLY showed up from table1, or the whole list showed up in table2 with no selection highlighted. My solution involved WHERE I put my selectedindex command. I had it before the DataBind() call and now that I moved it afterthe call, it works fine.  Here is my code that works:  

<<<<<<<<<START CODE>>>>>>>>>>>

'-->Declaring the OLEDB Connection
Dim oleConn As New OleDB.oleDbConnection()
oleConn.ConnectionString="Provider=Microsoft.Jet.OLEDB.4.0;data source=" & server.mappath("\test\prototype.mdb")
Dim oleComm AS NEW OleDb.oleDbCommand()
oleComm.Connection=oleConn

'--->SQL command that ONLY grabs the data from table2
oleComm.CommandText="SELECT * FROM table2"

'--> Using the dataadapter, because user will eventually change list values on-the-fly
dim da as New OleDb.OleDbDataAdapter()
Dim ds as New DataSet()
da.selectCommand=Olecomm
da.Fill(ds,"table2")

'--> Hosp1 is the dropdownlist
Hosp1.datasource=ds.Tables("table2").DefaultView

oleConn.Close()
hosp1.databind()

'---->This was the problem code. I had it above the databind() call. Once moved below, it works!
Hosp1.Selectedindex = Hosp1.Items.IndexOf(Hosp1.Items.FindByValue(Hosp.text))

'--->Printing text for verification of table1(Hosp.text) and table2(selecteditem,selectedindex) being equal
dim first as string="The hospital in spot on the dropdown is "
dim last as string =" and hospital "
response.write(first)
response.write(Hosp1.selectedindex)
response.write(" ")
response.write(Hosp1.selecteditem)
response.write(last)
response.write(Hosp.text)


<<<<<<<<<<<<END CODE>>>>>>>>>>>>>>>
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