I want to display records in my textbox - vb.net

Question

When i input the id number of the student in my TextBox, i want the details of that particular students to be displayed in my textbox, without using datagrid. i am using vb.net.
That is my code and i don't understand what's wrong:
cmd.CommandText = "SELECT * from tblsupplier where pro_code = '" & txcode.Text & "'"
dr = cmd.ExecuteReader
txname.Text = dr.item("sup_product")
txprice.Text = dr.Item("sup_price")

Answer 1

First off, you have left your application open to sql injection by adding the value of the textbox inline. Look up this topic please:
http://en.wikipedia.org/wiki/SQL_injection
As for your code, you need to call dr.Read() before you can actually access any properties from your query.
while (dr.Read()) {
// Do stuff
}
Good luck!

Answer 2

It would help if you could provide additional details about the error, friend. Like what SQL you are using, what was the error message, and which event triggers this reader command.
As it stands, it seems you haven't really sent the DataReader to scan the database. You need the While reader.read() loop.
Here is an example, using OLEDB in a function that fetches the data
Note that connstring is my SQL connection string to an Access Database
Dim conn As New System.Data.OleDb.OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data source=MyDatabase.mdb;Jet OLEDB:Database Password=;")
Function Mycheckifexistss(ByVal sqlCMDstring As String)
Dim sqlCmd As New OLEDBCommand(sqlCMDstring, conn)
Dim reader As OLEDBDataReader
Dim result As String = ""
Try
conn.Open()
reader = sqlcmd.ExecuteReader
While reader.Read
result = reader(0) 'this returns the first field of the queried result.
End While
conn.Close()
Return result
Catch ex As Exception
conn.Close() 'the first thing you want to do in an error, is to close the connection first.
MsgBox(ex.ToString)
End Try
End Function