private async void btnScanCrossProjects_Click(object sender, EventArgs e)
        {
            this.btnScanCrossProjects.Enabled = false;

            DateTime startDate = this.dtpStartDate.Value;
            DateTime endDate   = this.dtpEndDate.Value;

            if (endDate < startDate)
            {
                MessageBox.Show("End Date must be greater than Start Date.");
                return;
            }

            List <string> projects = new List <string>();

            if (this.chkProjectAATHETA.Checked)
            {
                projects.Add("AATHETA");
            }

            if (this.chkProjectCAGAMMA.Checked)
            {
                projects.Add("CAGAMMA");
            }

            if (this.chkProjectENGSUPP.Checked)
            {
                projects.Add("ENGSUPP");
            }

            if (this.chkProjectPMA.Checked)
            {
                projects.Add("PMA");
            }

            if (projects.Count == 0)
            {
                MessageBox.Show("Please select one project at least.");
                return;
            }

            var GetCaseListFromCrossProjects = JiraProxy.GetCaseListFromCrossProjects(startDate, endDate, projects);
            var issueListTmp = await GetCaseListFromCrossProjects;

            List <string> caseIdList = new List <string>();

            foreach (var issueInfo in issueListTmp)
            {
                string   caseIds     = issueInfo.fields.customfield_10600;
                String[] caseIDArray = caseIds.Split(',');

                Regex reg = new Regex(@"\d{2}ACC-\d{5}");
                foreach (string caseId in caseIDArray)
                {
                    if (reg.IsMatch(caseId))
                    {
                        if (!caseIdList.Contains(caseId.Trim()))
                        {
                            caseIdList.Add(caseId.Trim());
                        }
                    }
                }
            }

            string caseIdString = "";
            bool   isFirstOne   = true;

            foreach (string caseId in caseIdList)
            {
                if (isFirstOne)
                {
                    isFirstOne   = false;
                    caseIdString = caseId;
                }
                else
                {
                    caseIdString += "," + caseId;
                }
            }


            this.txtCaseIdList.Text = caseIdString;

            this.btnScanCrossProjects.Enabled = true;
        }