upload and download file from sqlserver

Creating sqlserver table

create table (id int,content_type varcahr(50),filename varcahr(50),filecontent varbinary(8000))


Code for c#.net



using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;
using System.IO;

public partial class filestore : System.Web.UI.Page
{
SqlConnection ObjSQlConnectionString = new SqlConnection("Data source=server_name;Initial Catalog=table_name;User Id=userid;Pwd=password");

protected void btn_upload_file_Click(object sender, EventArgs e)
{


string upload_path_name = upload.PostedFile.FileName.ToString();
string upload_file_name = Path.GetFileName(upload_path_name);
FileStream Upload_filestream = new FileStream(upload_path_name, FileMode.Open, FileAccess.Read);
BinaryReader upload_binaryreader = new BinaryReader(Upload_filestream);
Byte[] byte_data = upload_binaryreader.ReadBytes ((Int32)Upload_filestream.Length);
upload_binaryreader.Close();
Upload_filestream.Close();

if (upload.PostedFile.ContentType == "application/vnd.ms-excel")
{
//upload file in a seperate folder
upload.SaveAs("C:\\Inetpub\\wwwroot\\tools_test\\excel files\\"+upload_file_name);
}

Response.Write(byte_data.Length);


//insert data in sqlserver table

string insert_query = "insert into filestroage(content_type,filename,filecontent)values(@content_type,@filename,@filecontent)";

SqlCommand sql_command = new SqlCommand(insert_query, ObjSQlConnectionString);

sql_command.CommandType = CommandType.Text;

sql_command.Parameters.Add("@content_type", SqlDbType.VarChar).Value = upload.PostedFile.ContentType.ToString();
sql_command.Parameters.Add("@filename", SqlDbType.VarChar).Value = upload_file_name;
sql_command.Parameters.Add("@filecontent", SqlDbType.Binary).Value = byte_data;

ObjSQlConnectionString.Open();

sql_command.ExecuteNonQuery();

ObjSQlConnectionString.Close();

}

//Read files data from table
protected void Button1_Click(object sender, EventArgs e)
{
string strQuery = "select content_type,filename,filecontent from filestroage where id=@id";

SqlCommand sql_command = new SqlCommand(strQuery);

sql_command.Parameters.Add("@id", SqlDbType.Int).Value = 2;

DataTable data_table_query = GetData_table(sql_command);

if (data_table_query != null)
{
file_download (data_table_query);
}
}



private DataTable GetData_table(SqlCommand sql_command)
{
DataTable data_table = new DataTable();

SqlDataAdapter sql_adapter = new SqlDataAdapter();

sql_command.CommandType = CommandType.Text;

sql_command.Connection = ObjSQlConnectionString;

try
{
ObjSQlConnectionString.Open();

sql_adapter.SelectCommand = sql_command;

sql_adapter.Fill(data_table );

return data_table;

}

catch
{

return null;

}

finally
{

ObjSQlConnectionString.Close();

sql_adapter.Dispose();

ObjSQlConnectionString.Dispose();

}

}

//Download read data in their own file format
private void file_download(DataTable data_table_rows)
{

Byte[] data_bytes = (Byte[])data_table_rows.Rows[0]["filecontent"];

Response.Buffer = true;

Response.Charset = "";

Response.Cache.SetCacheability(HttpCacheability.NoCache);

Response.ContentType = data_table_rows.Rows[0]["content_type"].ToString();

Response.AddHeader("content-disposition", "attachment;filename="+ data_table_rows .Rows[0]["filename"].ToString());

Response.BinaryWrite(data_bytes);

Response.Flush();

Response.End();
}
}

Playing with simple Interface Concept

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication1
{
class Program:interface_first ,interface_second
{

public static void Main()
{
Console.WriteLine("INTERFACE TEST\n");

//call by class objects.
Program call_interface_first = new Program();
call_interface_first.method_for_interface("Invoke first interface method using object of first class");
call_interface_first.methos_for_second_interface("Invoke second interface method using object of first class\n");

second_calss call_interface_second = new second_calss();
call_interface_second.method_for_interface("Invoke first interface method using object of second class\n");



interface_first first_interface_call = call_interface_first;
first_interface_call.method_for_interface("Call the first interface using interface object with assing class objects");
interface_second second_interface_call = call_interface_first;
second_interface_call.methos_for_second_interface("Call the second interface using interface object with assing class objects\n");

//call by same interface objects.
interface_first call_using_interface_refference = new Program();
call_using_interface_refference.method_for_interface("call first interface using the same interface reference");
interface_first call_using_interface_refference1 = new second_calss();
call_using_interface_refference1.method_for_interface("call second interface using the same interface reference\n");

//call by interface array with same reference.
interface_first[] array_interface = { new Program(), new second_calss() };
for (int i = 0; i <= 1; i++)
{
array_interface[i].method_for_interface("Invoke interface methods from class in array format :" + i);

}

}

public string method_for_interface(string i)
{

Console.WriteLine(i.ToString());
return i;
}
public string methos_for_second_interface(string s)
{
Console.WriteLine(s.ToString());
return s;
}

}

interface interface_first
{
//void interface_method_first();
string method_for_interface(string i);

}
interface interface_second
{
string methos_for_second_interface(string s);
}

//second class for accessing Interface
class second_calss : interface_first
{
public string method_for_interface(string s)
{
Console.WriteLine(s.ToString());
return s;
}
}
}