Dataadapter not updating

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ADO.NET

Hi,

I am facing some problem while updating some data to database(Oracle) through a procedure using dataadapter's update method.

Following is the code:

int Ret;
OracleConnection MyConnection = new OracleConnection();
MyConnection.ConnectionString = ConfigurationManager.ConnectionStrings["ConnectionString"].ToString();
MyConnection.Open();
OracleCommand MyCommand = new OracleCommand();
OracleDataAdapter MyDataAdapter = new OracleDataAdapter();
MyCommand.Connection = MyConnection;
MyCommand.CommandType = CommandType.StoredProcedure;
string DBUserName = ConfigurationManager.AppSettings["DBUSERNAME"].ToString();
MyCommand.CommandText = DBUserName + ".PKG_EMPLOYEE_INFO.ENTER_LEAVE_DET";
OracleTransaction TRAN;
TRAN = MyConnection.BeginTransaction();
MyCommand.Transaction = TRAN;
MyCommand.Parameters.Clear();
MyCommand.Parameters.AddWithValue("@USER_FK_IN", Session["USER_PK"]);
MyCommand.Parameters.Add("@LEAVE_DATE_IN", OracleType.DateTime, 20, "LEAVE_DATE");
MyCommand.Parameters["@LEAVE_DATE_IN"].SourceVersion = DataRowVersion.Current;
MyCommand.Parameters.Add("@HALF_FULL_IN", OracleType.DateTime, 20, "HALF_FULL");
MyCommand.Parameters["@HALF_FULL_IN"].SourceVersion = DataRowVersion.Current;
MyCommand.Parameters.Add("@RETURN_VALUE", OracleType.VarChar, 30, "RETURN_VALUE").Direction = ParameterDirection.Output;
try
{
MyDataAdapter.RowUpdated += new System.Data.OracleClient.OracleRowUpdatedEventHandler(OnRowUpdated);
MyDataAdapter.InsertCommand = MyCommand;
MyDataAdapter.InsertCommand.Transaction = TRAN;
DataSet FullDS = new DataSet();
FullDS = (DataSet)ViewState["FULLDS"];
DataSet HalfDS = new DataSet();
HalfDS = (DataSet)ViewState["HALFDS"];
//LeaveDS = (DataSet)ViewState["LEAVEDS"];
FullDS.Merge(HalfDS);
Ret = MyDataAdapter.Update(FullDS);
if (arrMessage.Count > 0)
{
TRAN.Rollback();
}
else
{
TRAN.Commit();
Ret = Convert.ToInt16(MyCommand.Parameters["RETURN_VALUE"].Value);
}
}
catch (Exception ex)
{
TRAN.Rollback();
Ret = 0;
}
finally
{
MyConnection.Close();
}

But I am getting the following error at "

Ret = MyDataAdapter.Update(FullDS);

":

?ex.Message
"Update unable to find TableMapping['Table'] or DataTable 'Table'."

The FullDS is having the following status.
FullDS.Tables.Count = 1
FullDS.Tables[0].Rows.Count = 8

Please, anybody tell me why i am getting this error?