The name does not exist in the current context - oracle

Question

I'm trying to upload files to Oracle database Using C# vs2012. Its my first time I do so especially with Oracle. I just followed an example I found online but I got some errors before I even run the codes showing me that some of the type or name spaces don't exist.
The example I followed : Blob Example
Here are the codes that are underlined red in my Resources_to_upload.aspx.cs
objCmd
objConn
My code :
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data.OracleClient;
using System.Configuration;
using System.Data;
using System.IO;
using System.Text;
public partial class Resources_to_upload : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void cmdUpload_Click(object sender, EventArgs e)
{
try
{
if (fileUploadDocument.PostedFile.ContentLength > 0)
{
// Get the File name and Extension
string FileName = Path.GetFileName(fileUploadDocument.PostedFile.FileName);
string FileExtension = Path.GetExtension(fileUploadDocument.PostedFile.FileName);
//
// Extract the content of the Document into a Byte array
int intlength = fileUploadDocument.PostedFile.ContentLength;
Byte[] byteData = new Byte[intlength];
fileUploadDocument.PostedFile.InputStream.Read(byteData, 0, intlength);
//
// Save the file to the DB
string strConn = ConfigurationManager.ConnectionStrings["ConnectionString"].ToString();
object Conn = new OracleConnection(strConn);
//
StringBuilder strQueryBuilder = new StringBuilder("INSERT INTO RESOURCES(RESOURCES_ID, FILE_NAME, TYPE, RESOURCE_FILE) VALUES (");
strQueryBuilder.Append("'1', ");
strQueryBuilder.Append("'" + FileName + "', ");
strQueryBuilder.Append("'" + FileExtension + "', ");
strQueryBuilder.Append(" :RESOURCE_FILE)");
String strQuery = strQueryBuilder.ToString();
//
OracleParameter blobParameter = new OracleParameter();
blobParameter.ParameterName = "Resources_FILE";
blobParameter.OracleType = OracleType.Blob;
blobParameter.Direction = ParameterDirection.Input;
blobParameter.Value = byteData;
objCmd = new OracleCommand(strQuery, objConn);
objCmd.Parameters.Add(blobParameter);
//
objConn.Open();
objCmd.ExecuteNonQuery();
objConn.Close();
//
lblMsg.Text = "Document Uploaded Succesfully";
}
}
catch (Exception ex)
{
lblMsg.Text = " Error uploading Document: " + ex.Message.ToString();
}
}
}
Please help solve this issue. Thank you

Answer 1

StringBuilder is in the System.Text namespace. So you can either reference it explicitly:
System.Text.StringBuilder strQueryBuilder ...
Or add a using directive to the file:
using System.Text
...
StringBuilder strQueryBuilder ...
As for objCmd and objConn, where do you define those? They're not created in the code you posted. You do create a connection object here:
object Conn = new OracleConnection(strConn);
Maybe you mean to use Conn instead of objConn? But you don't create a command object anywhere. You need to declare and instantiate variables before you can use them.