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Populate DropDown List from Sql Database

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Join Date: Feb 2008

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firebirds98 firebirds98 is offline

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Populate DropDown List from Sql Database

Feb 19th, 2008

I am trying to populate a drop downlist on my page with data in flightnum from the table Air_Flight, my dropdownlist keeps having System.Data.Datarow in the dropdownlist. Im pretty sure im one line of code away from getting the actual values in the dropdownlist, I am just not sure which line of code it is. Also the dropdownlist sees how many records are in the db. For instance if i have the flight numbers '123' , '987', '487' it will have 3 System.Data.Datarow line in the dropdownlist and if I had another flight_num it will then have 4 System.Data.Datarow in the dropdownlist.

 Help with Code Tags 
 ASP.NET Syntax (Toggle Plain Text) 
sql = "Select flightnum from Air_flight"
        ddlflightnum.DataSource = objdb.getDataSet(sql)
        ddlflightnum.DataBind()
sql = "Select flightnum from Air_flight"
        ddlflightnum.DataSource = objdb.getDataSet(sql)
        ddlflightnum.DataBind()

Any help is appreciated!

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firebirds98 firebirds98 is offline

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Re: Populate DropDown List from Sql Database

Feb 19th, 2008

Please Delete this thread I figured it out I needed the line of code

ddlflightnum.DataValueField = "flightnum"

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SheSaidImaPregy SheSaidImaPregy is offline

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Re: Populate DropDown List from Sql Database

Feb 19th, 2008

Yup, you cannot populate a DropDownList like that. Code for that is as follows:

 Help with Code Tags 
 ASP.NET Syntax (Toggle Plain Text) 
Dim conn As New SqlConnection( connection )
Dim cmdSelect As New SqlCommand( ""Select flightnum from Air_flight", conn )
Dim dtrReader As SqlDataReader
 
Try
  conn.Open()
 
  dtrReader = cmdSelect.ExecuteReader()
 
  if dtrReader.HasRows then
    ddlflightnum.DataSource = dtrReader
    ddlflightnum.DataValueField = "flightnum"
    ddlflightnum.DataTextField = "flightnum"
    ddlflightnum.DataBind()
  end if
 
  dtrReader.Close()
  conn.Close()
Catch
End Try
 
Dim conn As New SqlConnection( connection )
Dim cmdSelect As New SqlCommand( ""Select flightnum from Air_flight", conn )
Dim dtrReader As SqlDataReader

Try
  conn.Open()

  dtrReader = cmdSelect.ExecuteReader()

  if dtrReader.HasRows then
    ddlflightnum.DataSource = dtrReader
    ddlflightnum.DataValueField = "flightnum"
    ddlflightnum.DataTextField = "flightnum"
    ddlflightnum.DataBind()
  end if

  dtrReader.Close()
  conn.Close()
Catch
End Try

Now if you do not specify DataTextField, it will default to the DataValueField.

You can populate it through a dataset how you were as well, but I would try to steer you away from datasets as it takes up a lot of resources and the above code is much more efficient.

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Join Date: Feb 2008

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dilipv

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Re: Populate DropDown List from Sql Database

Feb 20th, 2008

hi firebirds98,
You can populate DropDownlList from Sql database as follows.

connection_object.start_connection()
datareader_object = connection_object.executequery("SELECT city_name from City")
DropDownList1.Items.Clear()
While dr.Read
DropDownList1.Items.Add(dr(0))
End While
dr.Close()
connection_object.close_connection()

Hope this will help you.
Thanks & Regards
Dilipv

Dilip Kumar Vishwakarma
Programmer
.Net Consulting
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