How to change value of /GrpPwd/ Cell in all Rows? - vb.net

Question

I need to perform this SQL Query:
UPDATE Resurses SET GrpPwd = #GrpPwd1 WHERE Resurs = #Resurs1
For all rows in my Access Database using VB.NET
How can i do it?
I use this code but id doesn't work:
Password Generator:
Dim charset As String = nalf
Dim r As New Random()
Dim lenPass As Integer = r.Next(minLength, maxLength)
Dim str As String = String.Empty
For i As Integer = 0 To lenPass - 1
str += charset(r.Next(0, charset.Length))
Next
Return str
End Function
Update rows
If DataGridView1.CurrentRow.Cells(3).Value = "Yes" Then
nres = DataGridView1.CurrentRow.Cells(0).Value
nalf = DataGridView1.CurrentRow.Cells(6).Value
nsym = DataGridView1.CurrentRow.Cells(1).Value
Dim parol1 As String
Dim pwd As String = pass99(nsym, nsym) '
parol1 = pwd
Dim cmd As New OleDbCommand()
Dim Conn As New OleDb.OleDbConnection("Provider=Microsoft.ACE.oledb.12.0; Data source=" + bpath)
cmd.Connection = Conn
Conn.Open()
For i As Integer = 0 To k - 1
cmd.CommandText = String.Format("UPDATE Resurses SET GrpPwd = #GrpPwd1{0} WHERE Resurs = #Resurs1{0};", i)
cmd.Parameters.Add(String.Format("#GrpPwd1{0}", i), OleDbType.WChar).Value = parol1
cmd.Parameters.Add(String.Format("#Resurs1{0}", i), OleDbType.Integer).Value = nres
Next
cmd.ExecuteNonQuery()
Conn.Close()
MsgBox("All rows are updated!")
End If
f