Getting values back from OleDbDataReader reading from Access database

c#, ms-access, oledb

Solution

you have to call Read method like below (use using instead of disposing yourself connection

string connectionString = @"Provider=Microsoft Office 12.0 Access Database Engine OLE DB Provider;" + @"Data source= C:\Users\nearod\Desktop\ImportDB.accdb";

string queryString=  "SELECT * FROM [SQL Agent Unique ID Test Load]";
 try
     {
    using (OleDbConnection connection = new OleDbConnection(connectionString))
        {
            OleDbCommand command = new OleDbCommand(queryString, connection);
            connection.Open();
            OleDbDataReader reader = command.ExecuteReader();

            while (reader.Read())
            {
                string companyCode = reader.GetValue(0).ToString();
            string agentId = reader.GetString(1);
            string firstName = reader.GetString(2);
            string lastName = reader.GetString(3);
            string nameSuffix = reader.GetString(4);
            string corporateName = reader.GetString(5);
            string entityType = reader.GetString(6);
            string obfSSN = reader.GetString(7);
            string obfFEIN = reader.GetString(8);
            string dummyIndicator = reader.GetString(9);
            // Insert code to process data.
            }
            reader.Close();
        }
   }
catch (Exception ex)
   {
            MessageBox.Show("Failed to connect to data source");
   }

Problem

Below it the code I'm using to connect to an Access database and pull the values from the query. Problem is.. I cannot get any values back from the reader object. I can see that there are the correct amount of rows, however I keep getting an InvalidOperationException (whether I use GetValue() or GetString()) saying "No data exists for the row/column." ``` System.Data.OleDb.OleDbConnection conn = new System.Data.OleDb.OleDbConnection(); conn.ConnectionString = @"Provider=Microsoft Office 12.0 Access Database Engine OLE DB Provider;" + @"Data source= C:\Users\nearod\Desktop\ImportDB.accdb"; try { conn.Open(); OleDbCommand cmd = new OleDbCommand("SELECT * FROM [SQL Agent Unique ID Test Load]", conn); OleDbDataReader reader = cmd.ExecuteReader(); string companyCode = reader.GetValue(0).ToString(); string agentId = reader.GetString(1); string firstName = reader.GetString(2); string lastName = reader.GetString(3); string nameSuffix = reader.GetString(4); string corporateName = reader.GetString(5); string entityType = reader.GetString(6); string obfSSN = reader.GetString(7); string obfFEIN = reader.GetString(8); string dummyIndicator = reader.GetString(9); // Insert code to process data. } catch (Exception ex) { MessageBox.Show("Failed to connect to data source"); } finally { conn.Close(); } ```

Original source