How to search words or part of text in Word document using C# .Net

Hi babu935,

Pease refer the beow code.

Namespace

 You need to import the beow name space.

using Word = Microsoft.Office.Interop.Word;

 Code

protected void btnGet_Click(object sender, EventArgs e)
{
    object fileName = ""; //The filepath goes here
    string textToFind = ""; //The text to find goes here
    Word.Application word = new Word.Application();
    Word.Document doc = new Word.Document();
    object missing = System.Type.Missing;
    try
    {
        doc = word.Documents.Open(ref fileName, ref missing, ref missing,
        ref missing, ref missing, ref missing, ref missing, ref missing,
        ref missing, ref missing, ref missing, ref missing, ref missing,
        ref missing, ref missing);
        doc.Activate();
        foreach (Word.Range docRange in doc.Words)
        {
            if (docRange.Text.Trim().Equals(textToFind,
                StringComparison.CurrentCultureIgnoreCase))
            {
                docRange.HighlightColorIndex = Microsoft.Office.Interop.Word.WdColorIndex.wdDarkYellow;
                docRange.Font.ColorIndex = Microsoft.Office.Interop.Word.WdColorIndex.wdWhite;
            }
            Response.Write(docRange.Text);
        }
    }
    catch (Exception ex)
    {
        Response.Write("Error : " + ex.Message);
    }
}