Make column or cells readonly with EPPlus

Question

Is there a way to make a column or group of cells locked or read only using EPPlus? I've tried the code below both separate and together however neither seems to have the desired effect. Either the entire worksheet is locked (if I include the IsProtected statement) or nothing at all.

        ws.Protection.IsProtected = true;         ws.Column(10).Style.Locked = true; 

EDIT

Here is entire block of code from my controller

        FileInfo newFile = new FileInfo("C:\\Users\\" + User.Identity.Name + "\\Desktop" + @"\\ZipCodes.xlsx");          ExcelPackage pck = new ExcelPackage(newFile);          var ws = pck.Workbook.Worksheets.Add("Query_" + DateTime.Now.ToString());          //Headers         ws.Cells["A1"].Value = "ChannelCode";         ws.Cells["B1"].Value = "DrmTerrDesc";         ws.Cells["C1"].Value = "IndDistrnId";         ws.Cells["D1"].Value = "StateCode";         ws.Cells["E1"].Value = "ZipCode";         ws.Cells["F1"].Value = "EndDate";         ws.Cells["G1"].Value = "EffectiveDate";         ws.Cells["H1"].Value = "LastUpdateId";         ws.Cells["J1"].Value = "ErrorCodes";         ws.Cells["K1"].Value = "Status";         ws.Cells["I1"].Value = "Id";          //Content         int i = 2;         foreach (var zip in results)         {             ws.Cells["A" + i.ToString()].Value = zip.ChannelCode;             ws.Cells["B" + i.ToString()].Value = zip.DrmTerrDesc;             ws.Cells["C" + i.ToString()].Value = zip.IndDistrnId;             ws.Cells["D" + i.ToString()].Value = zip.StateCode;             ws.Cells["E" + i.ToString()].Value = zip.ZipCode;             ws.Cells["F" + i.ToString()].Value = zip.EndDate.ToShortDateString();             ws.Cells["G" + i.ToString()].Value = zip.EffectiveDate.ToShortDateString();             ws.Cells["H" + i.ToString()].Value = zip.LastUpdateId;             ws.Cells["J" + i.ToString()].Value = zip.ErrorCodes;             ws.Cells["K" + i.ToString()].Value = zip.Status;             ws.Cells["I" + i.ToString()].Value = zip.Id;              i++;         }          //ws.Protection.IsProtected = true;         ws.Column(10).Style.Locked = true;          return new ExcelResult             {                 FileName = "ZipCodes.xlsx",                 Package = pck             }; 

ExcelResult

public class ExcelResult : ActionResult {     public string FileName { get; set; }     public ExcelPackage Package { get; set; }      public override void ExecuteResult(ControllerContext context)     {         context.HttpContext.Response.Buffer = true;         context.HttpContext.Response.Clear();         context.HttpContext.Response.AddHeader("content-disposition", "attachment; filename=" + FileName);         context.HttpContext.Response.ContentType = "application/vnd.ms-excel";         context.HttpContext.Response.BinaryWrite(Package.GetAsByteArray());     } } 

Second Edit

I attempted to make the worksheet protected by setting the IsProtected value to true, then set the Locked property to false for every column except the last one. Not only was the spreadsheet not in read-only mode but I could edit the data in every column.

I did notice, however that I cannot resize the actual columns themselves, so maybe this is what I'm doing. I'd like to lock each cell in the column, however, so no new data can be entered.

        for (int a = 1; a < 10; a++)         {             ws.Column(a).Style.Locked = false;         }         ws.Protection.IsProtected = true; 

Answer 1

I am adding two WorkSheets and need to protect all columns except the one on third index.

This worked for me :)

worksheet2.Cells["A1"].LoadFromDataTable(dt_Data, true); //------load data from datatable worksheet2.Protection.IsProtected = true; //--------Protect whole sheet worksheet2.Column(3).Style.Locked = false; //-------Unlock 3rd column 

Answer 2

EPPlus may be defaulting to all cells being locked, in which case you need to set the Locked attribute to false for the other columns, then set IsProtected to true.