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string usname = null;
string psw = null;
string role = "";
string conString = "Provider=Microsoft.Jet.OleDb.4.0;Data Source=aa.mdb";
OleDbConnection conn = new OleDbConnection(conString);
conn.Open();
OleDbCommand cmd = new OleDbCommand();
cmd.Connection = conn;
cmd.CommandText = "select username,[password],role from [user]";
OleDbDataReader rdr = cmd.ExecuteReader();
while (rdr.Read())
{
usname = rdr["username"].ToString();
psw = rdr["password"].ToString();
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