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When we click on find button following is the code:

 if (TXBX_Find.Text != "")
            {
                 workbook = new Workbook(FOD_OpenFile.FileName);
                FindOptions Opts = new FindOptions();
                Opts.LookInType = LookInType.Values;
                Opts.LookAtType = LookAtType.Contains;
                string found = "";
                Cell cell = null;
                foreach (Worksheet sheet in workbook.Worksheets)
                {
                    found += Environment.NewLine + "Sheet: " + sheet.Name + ":";
                    do
                    {
                        cell = sheet.Cells.Find(TXBX_Find.Text, cell, Opts);
                        if (cell != null)
                            found += cell.Name + ",";
                    }
                    while (cell != null);
                }
                LBL_FindResults.Text = found;
            }

Clicking on Replace button following code is executed:

 if (TXBX_Find.Text != "" && TXBX_Replace.Text!="")
            {
                workbook = new Workbook(FOD_OpenFile.FileName);
                FindOptions Opts = new FindOptions();
                Opts.LookInType = LookInType.Values;
                Opts.LookAtType = LookAtType.Contains;
                string found = "";
                Cell cell = null;
                foreach (Worksheet sheet in workbook.Worksheets)
                {
                    do
                    {
                        cell = sheet.Cells.Find(TXBX_Find.Text, cell, Opts);
                        if (cell != null)
                        {
                            string celltext = cell.Value.ToString();
                            celltext = celltext.Replace(TXBX_Find.Text, TXBX_Replace.Text);
                            cell.PutValue(celltext);
                        }
                    }
                    while (cell != null);
                }
                LBL_FindResults.Text = "Replaced All Existing Values, Save the file now";
            }

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Sample Code