Retrieving file name from List collection if specified string exist in ASP.Net

Hi sureshMGR,

Refer the below code.

C#

protected void Page_Load(object sender, EventArgs e)
{
    List<string> filestxt = new List<string>();
    filestxt.Add("ZALS_8703502446_L_5.pdf");
    filestxt.Add("ZALS_8703502447_L_5.pdf");
    long documentno = 8703502447;
    List<string> files = new List<string>();
    for (int i = 0; i < filestxt.Count; i++)
    {
        if (filestxt[i].IndexOf(documentno.ToString()) > -1)
        {
            files.Add(filestxt[i]);
        }
    }
}