you can try "+" Plus operator between two string line, like:
string strquery = "INSERT INTO "+
"EMPLOYEE_REQUISITION_DETAILS2"+
"(REQNO,DIVISIONID,REQESITION_DT,LOCATION,EMPTYPE,JOBTYPE ,EDU_QULIFCATIONS,POSITION,NOOF_EMPLOYEES,"+
"EXPERIENCE_MIN,EXPERIENCE_MAX,PREF_JOINDT,SALARY_BUDGET,FILENAME,JOBDESC,RAISED_EMPID,RAISED_DT,"+
"PANEL_MEMBERS_TECH1,PANEL_MEMBERS_TECH2,Req_status) "+
"Values('" + txtRequisitionNumber.Text + "','" + ddlDivision.SelectedItem.Text + "','" + txtRequisitionDate.Text + "',"+
"'" + ddlLocation.SelectedItem.Text + " ','" + rbnl.SelectedItem.Text + "','" + rbnlJobType.SelectedItem.Text + "',"+
"'" + "MCA" + "' ,'" + ddlPosition.SelectedItem.Text + "','" + txtNoOfRequired.Text + "','" + ddlMin.SelectedItem.Text + "',"+
"'" + ddlMax.SelectedItem.Text + "','" + txtJoiningDate.Text + "','" + txtSalaryBudget.Text + "','" + "dd" + "',"+
"' " + strJobDescription + " ','" + txtEmpId.Text + "','" + txtDate.Text + "','" + strTechnicaRound1 + "',"+
"'" + strTechnicaRound2 + "','open')";