We can store data in multiple data in single column

 for (int i = 0; i < chkIndustry.Items.Count - 1; i++)
            {
                if (chkIndustry.Items[i].Selected == true)
                {
                    strIndustry += chkIndustry.Items[i].Value.ToString() + ",";
                }
            }
            strIndustry = strIndustry.TrimEnd(',');
            ObjJobseeker.IndustryId = strIndustry;