concatenate many rows into a single text string?

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Some Useful Syntex of Asp.Net.........

No. 1 : For Getting  GridView Row  in any event of GridView and Get RowIndex.......


 GridViewRow grrow = (GridViewRow)(((Control)e.CommandSource).NamingContainer);
 ViewState["RowIndex"] = grrow.RowIndex;

No. 2 : For Filtering Perticuler Row From Asp.Net DataTable........

DataRow[]

Creating a dynamically Text File & write in it.........

1.   Add These Two NameSpace in NameSpace Area:

using System.Text;

using System.IO;

2.   And write This code...........

  protected void Button1_Click(object sender, System.EventArgs e)

    {

        string appPath = Request.PhysicalApplicationPath;

        string filePath = appPath + "Text.txt";

        StreamWriter w;

        w = File.CreateText(filePath);

        w.WriteLine("This is a test line.");

        w.WriteLine("This is another line.");

        w.Flush();

        w.Close();

        Label1.Text = "File created and write successfully!";

        Label1.Text += filePath;

    }