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OleDbConnection conn = new OleDbConnection(@"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\db1.mdb;Persist Security Info=False");
conn.Open();
string cmdtxt = "Update users set rq=@rq";
OleDbCommand cmd = new OleDbCommand(cmdtxt, conn);
cmd.Parameters.Add("@rq", OleDbType.DBDate).Value = DateTime.Now;
cmd.ExecuteNonQuery();