how to open a file and save file at the runtime

I will tell you how to open a file and read the data form file at runtime on the click of button and do some simple calculation and save the data on the other file .....

First of all you have to  do following things:

1.You have to goto to the Add References under the Project then click on the  Microsoft.VisualBasic.

2.Then you have to add a button on a form and openFileDialog and saveFileDialog in a form

3.You have to add a namespace using Microsoft.VisualBasic;

 

then you have to write these code in button click function.

private void button5_Click(object sender, EventArgs e)

        {

               String str_open=null;

String str_save=null;

int CA=0,DLT=0,M=0,SUM=0;

    openFileDialog1.Filter = "Textfile(*.txt)|*.txt|ALL FILE(*.*)|*.*"; if (openFileDialog1.ShowDialog() == DialogResult.OK) { str_open = openFileDialog1.FileName; }

FileSystem.FileOpen(1, str_open, OpenMode.Input, OpenAccess.Read, OpenShare.Shared, 50);

saveFileDialog1.Filter = "Textfile(*.txt)|*.txt|ALL FILE(*.*)|*.*"; if (saveFileDialog1.ShowDialog() == DialogResult.OK) { str_save = saveFileDialog1.FileName; }

FileSystem.FileOpen(2, str_save, OpenMode.Output, OpenAccess.Write, OpenShare.Shared, 50);

FileSystem.Input(1, ref M); CA = (int)M; FileSystem.Input(1, ref M); DLT = (int)M;

SUM=CA+DLT;

FileSystem.Print(2,SUM);

FileSystem.FileClose(1);

FileSystem.FileClose(2);

}

Input file must contain two int value.