Description:

About Classes used -

#1: StreamReader class provides an access to read the data from Stream such as Text File.

#2: StreamWriter class provides an access to write the data from Stream such as Text File.

Namespace Required - System.IO, System.Diagnostics

Controls Used -

1. TextBox Control (txtOutput)

2. ListBox Control (lbInput)

2. Button Control (btnCopy, btnInputFile)

Here I implemented the Code for converting multiple Text Documents into single Text Document.

The Code:

1. Variable Declarations

StreamReader rdr; //StreamReader Object for Reading File

StreamWriter wrt; //StreamWriter Object for Writing File

Listing 1

2. Select the Input Text Files (code for “Select Input Files” Button).

using (OpenFileDialog file = new OpenFileDialog())
{
 file.Filter = "Only Text Documents|*.txt";
 //Allow to select multiple files
 file.Multiselect = true;
 //Show the Dialog Box & Select the Files
 file.ShowDialog();
 //Add the selected File Names to ListBox
 lbInput.Items.AddRange(file.FileNames);
}

Listing 2

3. Copy Data from Multiple Text Files to Single Text File (code for “Copy All” Button).

//Output File
wrt = new StreamWriter(txtOutput.Text, false);
//Copy All Data From Input file to Output file
foreach (String var in lbInput.Items)
{
 //Input File
 rdr = new StreamReader(var);
 //Start of New File
 wrt.WriteLine(Environment.NewLine +
 "File Name : " + var + Environment.NewLine);
 //Copy the Content of Input File(s) to Output File
 wrt.Write(rdr.ReadToEnd().ToString());
}
//Close the StreamWriter instance
wrt.Close();
MessageBox.Show("File Copied Successfully....");
//Open the Output file
Process.Start(txtOutput.Text);

Listing 3

4. Now execute the Application and see the result (Figure 1).

Intended Result:

image002.jpg

Figure 1

Summary:

In this piece of writing, using C# environment, we have seen basic stream input/output operation for copying multiple text files to single text file using StreamWriter & StreamReader classes.