Question

so I have asked how to change the value in a cell inside of excel using c#, but what if I want to change the value of a drop down list. The code I am using for sheet modifying is below. Any help is appreciated.

 public virtual Object ActiveSheet { get; set; }

 private void button3_Click(object sender, EventArgs e)
 {
 var sheet = (Excel._Worksheet)this.ActiveSheet; 
 sheet.Cells[6, 6] = "6";
 }

I get the sheet to open but when it goes to the list it gives me NullReferenceException.

Answer 1

Figured it out took me a long time please use it!!

  using Excel = Microsoft.Office.Interop.Excel;

  public virtual Object ActiveSheet { get; set; }

  private void button15_Click(object sender, EventArgs e)
    {
        //Gets ActiveSheet to Modify
        Excel.Application oXL;
        Excel.Workbook oWB;
        Excel.Worksheet oSheet;

        //Start Excel and get Application object.
        oXL = (Excel.Application)Marshal.GetActiveObject("Excel.Application"); 
        oXL.Visible = true;
        oWB = (Excel.Workbook)oXL.ActiveWorkbook; 
        oSheet = (Excel.Worksheet)oWB.ActiveSheet;

        //Generate Linear Guide Supports using Design Table in Solidworks
        if (comboBox1.Text == "0")//no external rails
        {
            oSheet.Cells[6, 4] = "0"; //Change Value in Cell in Excel Cell Location [y-axis, x-axis]
        }
        //Quit Excel
        oXL.Quit();
    }