Question

I have first manually created a DataSet in my project name recvd.xsd having corresponding recvd.xss. On my button click event i have done the following coding.

try 
{
    DataSet recvd_REPORT = new DataSet();
    DataTable REPORT = new DataTable();
    String dd_webCofig = ConfigurationManager.ConnectionStrings["server2"].ConnectionString;
    OdbcConnection ddlistconn = new OdbcConnection(dd_webCofig);
    ddlistconn.Open();

    REPORT = recvd_REPORT.Tables["REPORT"];
    DataColumn myDataColumn = new DataColumn();
    myDataColumn.DataType = typeof(System.Int32);
    myDataColumn.ColumnName = "RECEIVED";
    myDataColumn.ReadOnly = false;
    myDataColumn.Unique = false;
    // Add the Column to the DataColumnCollection.
    REPORT.Columns.Add(myDataColumn);

    string query = "SELECT case_no as \"RECEIVED\" from dcpanaji.Civil_t where dt_regis > '" + txtStartDate.Text + "' AND dt_regis < '" + txtEndDate.Text + "' AND court_no = " + DropDownList1.SelectedItem + "";
    Response.Write(query);
    OdbcCommand cmd = new OdbcCommand(query, ddlistconn);
    OdbcDataReader loginMyReader = cmd.ExecuteReader();

    OdbcDataAdapter adptr = new OdbcDataAdapter(query, ddlistconn);
    adptr.Fill(REPORT);

    ddlistconn.Close();   
}
catch (Exception ex)
{
    Response.Write(ex.Message);
}

I am getting the error as

Object reference not set to an instance of an object.

If i remove as \"RECEIVED\" from my SQL query and simply execute my SQL query than the result of my query is as follows (varies depending on user input)

200200000452011 ……, n numbers of 12 digit number.

Please help me to remove the error as to why am i not able to bind to DataTable.

I am getting the error before Response.Write(query); is executed, why is that problem?

I removed the try catch block and now i get the error as

Answer 1

try

SELECT case_no as `RECEIVED` ...

or just

SELECT case_no as RECEIVED ...

---

Anyway the correct DataSet filling code should look like this:

DataSet ds = new DataSet();
using (OdbcConnection connection = new OdbcConnection(connectionString))
using (OdbcCommand command = new OdbcCommand(sqlQuery, connection)
using (OdbcDataAdapter adapter = new OdbcDataAdapter(command)
{
    adapter.Fill(ds);
}