Read Word files and display number of paragraph based on DropDownList value on webpage using C# in ASP.Net

Hi Vinutha,

I have created sample please refer the below code.

HTML

<div>
    <table>
        <tr>
            <td>
                Search Text:
            </td>
            <td>
                <asp:TextBox runat="server" ID="txtSearchWord" Width="75px" />
            </td>
        </tr>
        <tr>
            <td>
                No of paragraph to display:
            </td>
            <td>
                <asp:DropDownList runat="server" ID="ddlNoOfPara" AutoPostBack="true" OnSelectedIndexChanged="ddlNoOfParaIndexChanged">
                    <asp:ListItem Text="Select" />
                    <asp:ListItem Text="1" />
                    <asp:ListItem Text="2" />
                    <asp:ListItem Text="3" />
                    <asp:ListItem Text="4" />
                    <asp:ListItem Text="5" />
                    <asp:ListItem Text="6" />
                    <asp:ListItem Text="7" />
                    <asp:ListItem Text="8" />
                    <asp:ListItem Text="9" />
                </asp:DropDownList>
            </td>
        </tr>
    </table>
    <br />
    <asp:Label ID="lblText" runat="server" />
</div>

Code

private string ReadFileContent(string path, int noOfPara, string searchText)
{
    StringBuilder sb = new StringBuilder();
    Application wordApp = new Application();

    object file = path;
    object nullObj = System.Reflection.Missing.Value;
    Document doc = wordApp.Documents.Open(
                    ref file, ref nullObj, ref nullObj,
                    ref nullObj, ref nullObj, ref nullObj,
                    ref nullObj, ref nullObj, ref nullObj,
                    ref nullObj, ref nullObj, ref nullObj);

    Paragraphs documentParagraph = doc.Paragraphs;
    ArrayList Pararray = new ArrayList();
    for (int i = 1; i <= documentParagraph.Count; i++)
    {
        sb.Append(documentParagraph[i].Range.Text);
        Pararray.Add(sb);
    }

    string[] newWordList = { };
    if (Pararray[0].ToString().ToLower().Contains(searchText.ToLower()))
    {
        newWordList = Pararray[0].ToString().Substring(Pararray[0].ToString().IndexOf(searchText), Pararray[0].ToString().Length - Pararray[0].ToString().IndexOf(searchText)).Split('\r');
    }

    StringBuilder sbNewWordList = new StringBuilder();
    if (newWordList.Length > noOfPara)
    {
        for (int j = 1; j <= noOfPara; j++)
        {
            string word = newWordList[j].ToString();
            sbNewWordList.Append(word + "\r");
        }
    }

    ((_Document)doc).Close();
    ((_Application)wordApp).Quit();
    return sbNewWordList.ToString().Replace("\r", "<br/>");
}
protected void ddlNoOfParaIndexChanged(object sender, EventArgs e)
{
    lblText.Text = ReadFileContent(@"F:\Test.docx", int.Parse(ddlNoOfPara.SelectedItem.Text.Trim()), txtSearchWord.Text.Trim());
}

Screenshot

Input Word Document.

I have a program that reads a word document and displays it on the webpage. 
I am storing all the paragraphs in the word document in an array list. 
Now I want to use arraylist.contains method to search for a particular word and then display the next 8-10 paragraphs after the string match. 
Can anyone help me on this? 
Here is the code so far.
Hello. I am already able to read paragraphs. 
I have put all the paragraphs in an array list. 
Now I have to use "arraylist.contains" method to find a specific word and read the next 8 to 10 paragraphs. 
Something like.
Suppose all the paragraphs are stored in an Array list.

OutPut