How do you populate textbox in winforms with access database in VB.NET on combobox selection change

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i am a beginner at vb.net and i am trying to fill the textboxes in my winform with the datafrom the access database on the selection of a value in the combobox. but this is the error i get.
no value given for one or more required parameters.

What I have tried:

Private Sub employeenamecmbbx_SelectedIndexChanged(sender As Object, e As EventArgs) Handles employeenamecmbbx.SelectedIndexChanged
        Try
            con = New OleDbConnection(cs)
            con.Open()
            Dim ct As String = "select allowances,basicsalary,cashbenefits,vehiclefueldriver,vehiclefuel,fuelonly,vehicleonly," &
                    "accomodationfurnishing,accomodationonly,furnishingonly,sharedaccomodation,marriageresponsibilities,disabled," &
                    "oldage,tier3contribution,lifeinsurance,childeducation,agedependency,trainingcost,ssn,NoOfDependants,nochildren," &
                    "BankName,AccountName,BankBranch,AccountNo," &
                    "from employeeregistration where employeename = ?"
            cmd = New OleDbCommand(ct)
            cmd.Connection = con
            cmd.Parameters.Add(New OleDbParameter("employeename", OleDbType.VarChar, 30))
            cmd.Parameters("employeename").Value = Trim(employeenamecmbbx.Text)
            Console.WriteLine("sql:" & cmd.CommandText)
            rdr = cmd.ExecuteReader()

            If rdr.Read Then
                Allowances.Text = Trim(rdr.GetValue(0).ToString())
                BasicSalary.Text = Trim(rdr.GetString(1))
                CashBenefits.Text = Trim(rdr.GetValue(2).ToString())
                vfd.Text = Trim(rdr.GetValue(2).ToString())
                vf.Text = Trim(rdr.GetValue(3).ToString())
                vonl.Text = Trim(rdr.GetValue(4).ToString())
                feun.Text = Trim(rdr.GetValue(5).ToString())
                accwf.Text = Trim(rdr.GetValue(6).ToString())
                accon.Text = Trim(rdr.GetValue(7).ToString())
                furon.Text = Trim(rdr.GetValue(8).ToString())
                shracc.Text = Trim(rdr.GetValue(9).ToString())
                maresp.Text = Trim(rdr.GetValue(10).ToString())
                disbl.Text = Trim(rdr.GetValue(11).ToString())
                olda.Text = Trim(rdr.GetValue(12).ToString())
                t3c.Text = Trim(rdr.GetValue(13).ToString())
                lifins.Text = Trim(rdr.GetValue(14).ToString())
                chedu.Text = Trim(rdr.GetValue(15).ToString())
                agdep.Text = Trim(rdr.GetValue(16).ToString())
                trncst.Text = Trim(rdr.GetValue(17).ToString())
                ssno.Text = Trim(rdr.GetValue(18).ToString())
                Nodependents.Text = Trim(rdr.GetValue(19).ToString())
                NoChildren.Text = Trim(rdr.GetValue(20).ToString())
                bntnmtxbx.Text = Trim(rdr.GetValue(21).ToString())
                actntxbx.Text = Trim(rdr.GetValue(22).ToString())
                brncnamtxbx.Text = Trim(rdr.GetValue(23).ToString())
                accnmtxbx.Text = Trim(rdr.GetValue(24).ToString())
            End If
            If Not rdr Is Nothing Then
                rdr.Close()
            End If

Posted 12-Jan-17 2:42am

Masta Pee

Updated 12-Jan-17 5:36am

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Comments

[no name] 12-Jan-17 9:44am

I do not think there should be a comma between AccountNo and from in your SELECT statement. Also, it would probably be simpler just to say Select * from ....

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F-ES Sitecore · Accepted Answer · 2017-01-12T05:36:00

Solution 2

Whenever you get an error always say what line it is on. Assuming the error is when you execute the SQL, things to check are

Trim(employeenamecmbbx.Text)

make sure "employeenamecmbbx.Text" returns what you expect.

Next go through all the fields in your select (allowances, basicsalary etc) and ensure they all exist in the employeeregistration table and that there are no spelling mistakes.

Also you have an extra comma here

"BankName,AccountName,BankBranch,AccountNo," &

change that to

"BankName,AccountName,BankBranch,AccountNo " &

Posted 12-Jan-17 5:36am

F-ES Sitecore

Comments

Masta Pee 12-Jan-17 12:10pm

thank you so much .. i have checked all that but still doesnt work.
can you send me a simple sample code to look on

Masta Pee 12-Jan-17 12:18pm

error happens on this line
rdr = cmd.ExecuteReader()

Er.Muneer Khan 17-Jan-17 6:37am

have you defined DataReader rdr, you put rdr but where is object defination