Save PDF file to SQL database and reader

I am using C#. I want to store PDF files from a Windows forms application to a SQL database. And I want to retrieve it to my Windows Forms application again. What controls can I use to upload PDF files (for example for image I use picture box). What is the data type for PDF files?

Thanks in advance

public void getTestReportDocument(string reportid, string extenstype)
{

    try
    {
        string filesName = "";
        if (sqlConn.State == ConnectionState.Closed)
            sqlConn.Open();

        if(extenstype == ".pdf")
        {
            filesName = Path.GetTempFileName();

        }
        else
        {
            filesName = Path.GetTempFileName() + extenstype;
        }


        SqlCommand cmd = new SqlCommand("GetTestReportDocuments", sqlConn);
        cmd.CommandType = CommandType.StoredProcedure;
        cmd.Parameters.AddWithValue("@ReportID", reportid);

        using (SqlDataReader dr = cmd.ExecuteReader(System.Data.CommandBehavior.Default))
        {
            while (dr.Read())
            {
                int size = 1024 * 1024;
                byte[] buffer = new byte[size];
                int readBytes = 0;
                int index = 0;
                using (FileStream fs = new FileStream(filesName, FileMode.Create, FileAccess.Write, FileShare.None))
                {
                    while ((readBytes = (int)dr.GetBytes(0, index, buffer, 0, size)) > 0)
                    {
                        fs.Write(buffer, 0, readBytes);
                        index += readBytes;

                    }
                }

            }
        }
        Process prc = new Process();
        prc.StartInfo.FileName = filesName;
        prc.Start();

    }

    catch (Exception ex)
    {
        throw ex;
    }

    finally
    {
        //daDiagnosis.Dispose();
        //daDiagnosis = null;
    }

}