Actually I Want To Insert The Dataset Values In A Database Table And Than Print In A Crystal Report,So While Doing So I Am Getting An Error On The For Loop That "Object Reference Was Not Set" Which...

Question

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C#

private void button1_Click(object sender, EventArgs e)
{
   DataSet ds = new DataSet();
   using (OleDbConnection con = new OleDbConnection())
   {
      con.ConnectionString = "Data Source=XE; User ID=ER; Password=ER;Provider=msdaora";
      con.Open();
      OleDbCommand cmd = new OleDbCommand();
      cmd.Connection = con;
      cmd.CommandText = "select * from bill where BILL_NO = '" + Convert.ToString(comboBox1.SelectedValue) + "' ";
      cmd.CommandType = CommandType.Text;
      OleDbDataAdapter adp = new OleDbDataAdapter(cmd);
      adp.Fill(ds);
      con.Close();
   }
   string insqry = "INSERT INTO BILL2 (BILL_NO, CUSTOMER__NAME, ITEM_TAKEN, PRICE, MODE_OF_PAYMENT, TOTAL, DATE_PUR, SALE_FROM) VALUES (:BILL_NO, :CUSTOMER__NAME, :ITEM_TAKEN, :PRICE, :MODE_OF_PAYMENT, :TOTAL, :DATE_PUR, :SALE_FROM)";

   OracleConnection conn = new OracleConnection("Data Source=XE;Persist Security Info=True;User ID=ER;Password=ER;Unicode=True");
   conn.Open();
   OracleTransaction trans = conn.BeginTransaction();
   OracleDataAdapter ad = new OracleDataAdapter();
   ad.InsertCommand = new OracleCommand(insqry, conn);
   //int A = 0;
   foreach (DataRow drrow in ds.Tables["A"].Rows)
   {
      ad.InsertCommand.Parameters.Add(new OracleParameter(":BILL_NO", drrow["BILL_NO"]));
      ad.InsertCommand.Parameters.Add(new OracleParameter(":CUSTOMER__NAME", drrow["CUSTOMER__NAME"]));
      ad.InsertCommand.Parameters.Add(new OracleParameter(":ITEM_TAKEN", drrow["ITEM_TAKEN"]));
      ad.InsertCommand.Parameters.Add(new OracleParameter(":PRICE", drrow["PRICE"]));
      ad.InsertCommand.Parameters.Add(new OracleParameter(":MODE_OF_PAYMENT", drrow["MODE_OF_PAYMENT"]));
      ad.InsertCommand.Parameters.Add(new OracleParameter(":TOTAL", drrow["TOTAL"]));
      ad.InsertCommand.Parameters.Add(new OracleParameter(":DATE_PUR", drrow["DATE_PUR"]));
      ad.InsertCommand.Parameters.Add(new OracleParameter(":SALE_FROM", drrow["SALE_FROM"]));
      ad.InsertCommand.Transaction = trans;
      ad.InsertCommand.ExecuteNonQuery( );
   }
   conn.Dispose();
   MessageBox.Show("DONE");
}

Posted 29-Apr-14 23:19pm

Member 10784192

Updated 29-Apr-14 23:55pm

phil.o

v5

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Comments

OriginalGriff 30-Apr-14 5:25am

This is not a good question - we cannot work out from that little what you are trying to do.
Remember that we can't see your screen, access your HDD, or read your mind.
So at least tell us which line is causing the exception?
Use the "Improve question" widget to edit your question and provide better information.

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DamithSL · Accepted Answer · 2014-04-29T23:41:00

Solution 1

As per your sql statements you are trying to insert selected rows from one table to another.

With INSERT ... SELECT, you can quickly insert many rows into a table from one or many tables. For example:

SQL

INSERT INTO tbl_temp2 (fld_id)
  SELECT tbl_temp1.fld_order_id
  FROM tbl_temp1 WHERE tbl_temp1.fld_order_id > 100;

you can insert all the record by single ExecuteNonQuery as below

C#

using (OracleConnection connection = new OracleConnection(connectionString))
{
    OracleCommand command = new OracleCommand(myExecuteQuery, connection);
    command.Connection.Open();
    command.ExecuteNonQuery();
}

Posted 29-Apr-14 23:41pm

DamithSL

Comments

Member 10784192 30-Apr-14 6:11am

i need to know why the above mentioned error is occurring in the for each loop every time tried running the program.can anyone explain this please

[no name] 30-Apr-14 7:49am

It's for exactly the same reason that everyone else on the planet gets that error. You are trying to use an object that is null.

Member 10784192 30-Apr-14 8:01am

Exactly i have read about this error and you are very true but the thing is that i couldn't find the object which is basically declared as null.The code is there above can you help me out Wes Aday