private void BindMachineDocuments()
        {
            try
            {
                hdnFieldIDForPB.Value  = "";
                hdnColNameForPB.Value  = "";
                hdnFileNameForPB.Value = "";
                string view = "nodate";
                string fromDate = "", toDate = "";
                if (txtFromDate.Text.Trim() == "" && txtFromDate.Text.Trim() == "")
                {
                    view = "nodate";
                }
                else
                {
                    if (txtFromDate.Text.Trim() == "")
                    {
                        ScriptManager.RegisterStartupScript(this, this.GetType(), "warning", "openWarningModal('Please select From Date.');", true);
                        return;
                    }
                    if (txtToDate.Text.Trim() == "")
                    {
                        ScriptManager.RegisterStartupScript(this, this.GetType(), "warning", "openWarningModal('Please select To Date.');", true);
                        return;
                    }
                    fromDate = txtFromDate.Text.Trim();
                    toDate   = txtToDate.Text.Trim();
                    view     = "date";
                }



                BsonArray model = new BsonArray();
                if (ddlModel.SelectedValue == "All")
                {
                    foreach (ListItem item in ddlModel.Items)
                    {
                        model.Add(item.Value);
                    }
                }
                else
                {
                    model.Add(ddlModel.SelectedValue);
                }
                BsonArray machineSlno = new BsonArray();
                if (ddlMachineNumber.SelectedValue == "All")
                {
                    foreach (ListItem item in ddlMachineNumber.Items)
                    {
                        machineSlno.Add(item.Value);
                    }
                }
                else
                {
                    machineSlno.Add(ddlMachineNumber.SelectedValue);
                }

                BsonArray category = new BsonArray();
                if (ddlCategory.SelectedValue == "All")
                {
                    foreach (ListItem item in ddlCategory.Items)
                    {
                        category.Add(item.Value);
                    }
                }
                else
                {
                    category.Add(ddlCategory.SelectedValue);
                }
                BsonArray subcategory = new BsonArray();
                if (ddlSubCategory.SelectedValue == "All")
                {
                    foreach (ListItem item in ddlSubCategory.Items)
                    {
                        subcategory.Add(item.Value);
                    }
                }
                else
                {
                    subcategory.Add(ddlSubCategory.SelectedValue);
                }

                List <eDocumentData> list = MongoDBAccess.getMachineDocumentsDetails(model, machineSlno, category, subcategory, fromDate, toDate, view);
                lvMachineDocs.DataSource = list;
                lvMachineDocs.DataBind();
                lvMachineDocsCardView.DataSource = list;
                lvMachineDocsCardView.DataBind();
            }
            catch (Exception ex)
            {
            }
        }