Filling in DataTable using OleDb

[maylortaylor]

For some reason I am having problems doing this simple task. I just want to run a query in Access to select a
a field from the table that is "like" the string being inputted.

However, the dataset comes back empty...well not empty, I get a column name but no data. So when I type in

ds.Tables[0].Columns[0].ColumnName

, I get the column name coming from the database ("ParcelNumber" ).

When I run the query inside Access I receive the desired information. But when I try to check for the info in code

ds.Rows[0]

, I get "There is no row at position 0".

public DataTable FindFullPNusingPartialPN(string _parcelNumber)
            {
                 OleDbConnection conn = new OleDbConnection("Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + ConfigurationManager.AppSettings["TaxCert_Database"]);                DataTable dt = new DataTable();
                try
                {
                string query = "SELECT ParcelNumber FROM Orders WHERE ParcelNumber LIKE '*" + _parcelNumber + "*';";
               
                OleDbDataAdapter adapter = new OleDbDataAdapter(query, conn);             
                                 
                DataSet ds = new DataSet();
                adapter.Fill(ds);
                

                if (ds.Tables[0].Rows.Count >= 0)
                {
                    dt = ds.Tables[0];
                }
                    
                }

                catch (Exception ex)
                {
                  throw;
                }
                finally
                {
                    if (conn.State == ConnectionState.Open)
                    {
                        conn.Close();
                    }
                }
                return dt;
            }

[maylortaylor]

Fixed it. Went with .Parameters and changed my "*" to "%".

 public DataTable FindFullPNusingPartialPN(string _parcelNumber)
            {

                string connString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + ConfigurationManager.AppSettings["TaxCert_Database"];
                DataTable dt = new DataTable();
                
                try
                {
                    OleDbConnection conn = new OleDbConnection(connString);
                    string query = "SELECT ParcelNumber FROM Orders WHERE ParcelNumber LIKE @_parcelNumber;";

                    OleDbDataAdapter adapter = new OleDbDataAdapter(query, conn);
                    adapter.SelectCommand.Parameters.Add("@_parcelNumber", OleDbType.VarChar).Value = "%" + _parcelNumber + "%";

                    DataSet ds = new DataSet();
                    adapter.Fill(ds);


                    if (ds.Tables[0].Rows.Count >= 1)
                    {
                        dt = ds.Tables[0];
                    }

                } 


                catch (Exception ex)
                {
                    //myLogger.Log(ex.Message, ex.TargetSite.ToString(), ex.StackTrace);
                    throw;
                }
                finally
                {
                    //if (conn.State == ConnectionState.Open)
                    //{
                    //    conn.Close();
                    //}
                }
                return dt;
            }