SqlException caught error

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Please i am having an error from my demo airline website i am designing for learning purpose.The error is must declare the scalar variable "@Dep"
Below is my code to use user selected values to display result from a database. was caught

Protected Sub buttFindFlight_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles buttFindFlight.Click
        Try

            Dim conn As New SqlConnection
            Dim cmd As New SqlCommand
            Dim adp As New SqlDataAdapter
            Dim ds As New DataSet
            conn.ConnectionString = ConfigurationManager.ConnectionStrings("AirportReservationSystemConnectionString").ConnectionString
            cmd.Connection = conn
            conn.Open()
            'cmd.CommandType = CommandType.Text


            adp = New SqlDataAdapter("select LeavPlace as Departing, DestPlace As Destination FROM  DailyFlightInfo where LeavPlace =@Dep And DestPlace =@Dest ", conn)

            cmd.Parameters.Add(New SqlParameter("@Dep", SqlDbType.VarChar, 50))
            cmd.Parameters.Add(New SqlParameter("@Dest", SqlDbType.VarChar, 50))

            cmd.Parameters("@Dep").Value = drpLeaving.SelectedItem.Value
            cmd.Parameters("@Dest").Value = drpGoing.SelectedItem.Value

            adp.Fill(ds)
            gridView.DataSource = ds
            gridView.DataBind()

Posted 4-Jun-12 23:33pm

jamiebones

Updated 4-Jun-12 23:36pm

Abhinav S

v2

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2 solutions

Solution 1

What does @Dep stands for?
Are you trying to use parameterized query.
If so, use sqlcommand instead of SqlDataAdapter. Here is an Example[^]

Regards
Sebastian

Posted 4-Jun-12 23:46pm

Sebastian T Xavier

Updated 4-Jun-12 23:55pm

v4

Comments

codeBegin 5-Jun-12 5:47am

Is this your answer??

jamiebones 5-Jun-12 5:49am

yes i am using parametrized query and it represent a user selected value

Sebastian T Xavier 5-Jun-12 7:31am

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Oshtri Deka · Accepted Answer · 2012-06-05T01:13:00

I can't find connection between your command and dataAdapter therefore try this:

VB

'...

cmd.CommandText = "select LeavPlace as Departing, DestPlace As Destination FROM  DailyFlightInfo where LeavPlace =@Dep And DestPlace =@Dest "

cmd.Parameters.Add(New SqlParameter("@Dep", SqlDbType.VarChar, 50))
cmd.Parameters.Add(New SqlParameter("@Dest", SqlDbType.VarChar, 50))
cmd.Parameters("@Dep").Value = drpLeaving.SelectedItem.Value
cmd.Parameters("@Dest").Value = drpGoing.SelectedItem.Value

adp = New SqlDataAdapter(cmd);

adp.Fill(ds)
gridView.DataSource = ds
gridView.DataBind()

'...