multiple insert value

Question

HI

I want to insert multiple values of checkbox list in single column seperated by comma.my insert code is

---------------------------------------

SQL CODE

Insert into PR_LWFSetting(SrNo, MonApp ) Select SrNo, MonApp From OPENXML (@DocPR_LWFSetting, '/PR_LWFSetting/Row',2) 

WITH ( SrNo int 'SrNo',

        MonApp varchar(50) 'MonApp'              ) 

------------------------------------------

ASP .NET

save code

 xmlPR_LWFSetting.Append("<MonApp>");

xmlPR_LWFSetting.Append(SelectedValue);

  //xmlPR_LWFSetting.Append(this.chkMonth.SelectedValue)xmlPR_LWFSetting.Append("</MonApp>");

where code for SelectedValue is 

 string SelectedValue = string.Empty, blankValue = string.Empty;

        foreach (ListItem item in chkMonth.Items)

        {

            if (item.Selected)

            {

                SelectedValue += item.Value + ",";

            }

            else

            {

                blankValue += item.Value + ",";

            }

        }

I am getting an error 

Conversion failed when converting the varchar value '1,2,' to data type int