Problem with cmd.ExecuteNonQuery() - oracle

Question

I am inserting values in to Database from a Webform using ADO.NET, C#. DB I am using is Oracle Database. Values are not being inserted and the program gets struck at the cmd.ExecuteNonquery()
Here is my Code below, Please let me know If I am doing any mistake.. I am using some Static Methods will that be any problem ?..
public Boolean AddDivCo(Int32 UserNo,String ID, String Role, String DivName )
{
Boolean ret = false;
OracleCommand cmd = new OracleCommand();
OracleConnection conn = new OracleConnection();
int i = 0;
try
{
conn.ConnectionString = ConfigurationManager.ConnectionStrings["Conn_RIS"].ConnectionString;
conn.Open();
cmd.Connection = conn;
String mySQL = "INSERT INTO R4CAD_ADMIN (AdminUserNo, AdminID, AdminRole, AdminDivName)VALUES(:AdminUserNo,:AdminID,:AdminRole,:DivName)";
OracleParameter p1 = new OracleParameter("AdminUserNo", OracleType.Number);
p1.Value = UserNo;
cmd.Parameters.Add(p1);
OracleParameter p2 = new OracleParameter("AdminID", OracleType.VarChar);
p2.Value = ID;
cmd.Parameters.Add(p2);
OracleParameter p3 = new OracleParameter("AdminRole", OracleType.VarChar);
p3.Value = Role;
cmd.Parameters.Add(p3);
OracleParameter p4 = new OracleParameter("DivName", OracleType.VarChar);
p4.Value = DivName;
cmd.Parameters.Add(p4);
cmd.CommandText = mySQL;
i = cmd.ExecuteNonQuery();
if (i != 0)
{
ret = true;
}
else
{
ret = false;
}
}
catch (Exception err)
{
Console.WriteLine(err.Message.ToString());
}
finally
{
cmd.Dispose();
//cmd = null;
//conn = null;
conn.Close();
}
return ret;
}

Answer 1

Is there a primary key defined on this table? If so, then my guess is that you have another session that already has inserted a record with this key, but has not yet terminated the transaction with a commit or rollback. I don't see a commit as part of your code - I assume you're doing that somewhere else?
Execute your code above once more, and while it's hung run the following query from another session:
SELECT
(SELECT username FROM v$session WHERE sid=a.sid) blocker,
a.sid,
' is blocking ',
(SELECT username FROM v$session WHERE sid=b.sid) blockee,
b.sid
FROM v$lock a JOIN v$lock b ON (a.id1 = b.id1 AND a.id2 = b.id2)
WHERE a.block = 1
AND b.request > 0;
This should tell you if you're being blocked by another session and what the SID is of that session.