Question

I have created an excel 2007 workbook that has hidden worksheets in. There is one worksheet unhidden that has commands buttons with each worksheet name on each command button. When a command button is clicked, the hidden worksheet should be made visible and the focus should be placed on that worksheet. The code below returns this error:

An object reference is required for the non-static field, method, or
property ‘Microsoft.Office.Tools.Excel.WorksheetBase.Visible get’

using System;
using System.Collections.Generic;
using System.Data;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Xml.Linq;
using Microsoft.Office.Tools.Excel;
using Microsoft.VisualStudio.Tools.Applications.Runtime;
using Excel = Microsoft.Office.Interop.Excel;
using Office = Microsoft.Office.Core;

namespace TestProj
{
    public partial class Sheet17
    {
        private void Sheet17_Startup(object sender, System.EventArgs e)
        {
        }

        private void Sheet17_Shutdown(object sender, System.EventArgs e)
        {
        }

        #region VSTO Designer generated code

        /// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        private void InternalStartup()
        {
            this.button1.Click += new System.EventHandler(this.button1_Click);
            this.Startup += new System.EventHandler(this.Sheet17_Startup);
            this.Shutdown += new System.EventHandler(this.Sheet17_Shutdown);

        }

        #endregion

        private void checkedListBox1_SelectedIndexChanged(object sender, EventArgs e)
        {

        }

        private void button1_Click(object sender, EventArgs e)
        {
            Sheet5 How = new Sheet5();
            How.Visible = Excel.XlSheetVisibility.xlSheetVisible;
        }

    }
}

Can someone please help me with this error?

Answer 1

Use like this;

Sheet5 mySheet = new Sheet5();
mySheet.Visible = Excel.XlSheetVisibility.xlSheetVisible; 

or make your Sheet5 class static. You can’t access to your non-static class without any create an instance of this class.

Read it from MSDN.