accessing data from table error = no value given for one or more required parameters

[rahul more]

My aim is - Access data from table and show it into a form's textboxes , comboxes for edition of data.
I am using listview. I am selecting particular row of listview by clicking on that row and after clicking on toolbar's Button, I want that , the data of entire selected row should show in textbox and comboxes of form. I am doing this by calling a function "Editt()" at toolbar's button click event which are as follows : -

 
Option Explicit
Public con As ADODB.Connection
Public rs As ADODB.Recordset
 
Public Function conn()  ' for connection 
Set con = New ADODB.Connection
con.ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" & App.Path & "\CCMS.mdb;Persist Security Info=False"
con.Open "CCMS.mdb" 
End Function
 
Public Function reco()      ' for recordset
Set rs = New ADODB.Recordset
End Function
---------------------------------------------------------
This code gives the row no which is selected by you.
Private Sub lvwSchlStud_Click()
If lvwSchlStud.ListItems.Count <> 0 Then
lvwSchlStud.Tag = lvwSchlStud.ListItems(lvwSchlStud.SelectedItem.Index)
End If
End Sub
=========================================================
Function Editt()
 
If lvwSchlStud.Tag <> "" Then
           Call reco   
           rs.Open "select Fname, Lname, Mname, InstName, StdYear, BatchTime, BatchName, BatchType, Gender, ParName, SelfNo, FatherNo, MotherNo, ResiNo, Addr, Email, DOB, Batch, InstType from StudRecord where StudID = " & Int(lvwSchlStud.Tag) & "", con, adOpenStatic, adLockPessimistic
               With frmUpdateStudent
                      .txtFirstName.Text = rs!Fname
                      .txtLastName.Text = rs!Lname
                      .txtMidName.Text = rs!Mname
                      .txtInstName.Text = rs!InstName
                      .cboStdYear.Text = rs!StdYear
                      .cboBtchTime.Text = rs!BatchTime
                      .cboBtchName.Text = rs!BatchName
                      .cboBtchType.Text = rs!BatchType
                      .cboGender.Text = rs!Gender
                      .txtParName.Text = rs!ParName
                      .txtSelfNo.Text = rs!SelfNo
                      .txtFathrNo.Text = rs!FatherNo
                      .txtMothrNo.Text = rs!MotherNo
                      .txtResiNo.Text = rs!ResiNo
                      .txtAddr.Text = rs!Addr
                      .txtEmailID.Text = rs!Email
                      .DT1 = rs!DOB
                      .cboSchlColl.Text = rs!InstType   
                      .cboBtch.Text = rs!Batch      
               End With
 
                      frmUpdateStudent.Show vbModal
        Else: MsgBox "No record is selected!!", vbExclamation, "System Alert"
End If
 
End Function
 
 

This function accessing data from table by using SQL query and putting into respective textbox and comobox Example - txtLastName.Text = rs!Lname

VB giving me error at - rs.Open "select Fname, Lname, Mname, InstName, StdYear, BatchTime, BatchName, BatchType, Gender, ParName, SelfNo, FatherNo, MotherNo, ResiNo, Addr, Email, DOB, Batch, InstType from StudRecord where StudID = " & Int(lvwSchlStud.Tag) & "", con, adOpenStatic, adLockPessimistic

One Important thing i want to tell you that - in listview i am showing data in following way-
StudID, Fname, Mname, Lname, InstName, StdYear, BatchTime, BatchName, BatchType, Gender, ParName, SelfNo, FatherNo, MotherNo, ResiNo, Addr, Email, DOB