change password in asp.net,c#,ms-access database - asp.net

Question

i am desiging a change password screen in asp.net,c#,MS-access database
i m having 4 fields
userid,
oldpassword,
newpassword
confirm password
NOW I M NOT GETTING RESULT THE COUNT RETURNS 0 I HAVE UPDATED MY CODE
my code is as follows
try
{
OleDbConnection myCon = new OleDbConnection(ConfigurationManager.ConnectionStrings["vhgroupconnection"]
.ConnectionString);
myCon.Open();
string userid = txtuserid.Text;
string oldpass = txtoldpass.Text;
string newPass = txtnewpass.Text;
string conPass = txtconfirmpass.Text;
string q = "select user_id,passwd from register where user_id = #userid and passwd = #oldpass";
OleDbCommand cmd = new OleDbCommand(q, myCon);
cmd.Parameters.AddWithValue("#userid", txtuserid.Text);
cmd.Parameters.AddWithValue("#oldpass", txtoldpass.Text);
OleDbDataReader re = cmd.ExecuteReader();
re.Read();
if (re["user_id"].ToString() != String.Empty && re["passwd"].ToString() != String.Empty)
{
if (newPass.Trim() != conPass.Trim())
{
lblmsg.Text = "New Password and old password does not match";
}
else
{
q = "UPDATE register SET passwd = #newPass WHERE user_id =#userid";
cmd = new OleDbCommand(q, myCon);
cmd.Parameters.AddWithValue("#userid", txtuserid.Text);
cmd.Parameters.AddWithValue("#newPasss", txtnewpass.Text);
int count = cmd.ExecuteNonQuery();
if (count > 0)
{
lblmsg.Text = "Password changed successfully";
}
else
{
lblmsg.Text = "password not changed";
}
}
}
}
catch(Exception ex)
{
throw ex;
}
plz help me to solve the error

Answer 1

You're getting the error, No constructor is defined, because you can't directly instantiate this object. As stated on MSDN:
To create an OleDbDataReader, you must call the ExecuteReader method
of the OleDbCommand object, instead of directly using a constructor.
Essentially, you'd do something like the following after creating your connection and specifying your query:
OleDbDataReader re = cmd.ExecuteReader();