How to seperate the string into different lines in asp.net with c#.net

First, just add '+' where you think it a good idea:

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(...

Second, don't do it like that! Do not concatenate strings to build a SQL command. It leaves you wide open to accidental or deliberate SQL Injection attack which can destroy your entire database. Use Parametrized queries instead. They also make your query a lot easier to read...

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')";

This isn't going to be the answer you wanted, but I think it's important enough to mention. You need to totally rethink how you're doing this. Your code is at extremely high risk of SQL Injection:

http://en.wikipedia.org/wiki/SQL_injection[^]

https://www.owasp.org/index.php/SQL_Injection[^]

Creating dynamic SQL by means of concatenating strings with unsanitized input values like this:

'" + txtRequisitionNumber.Text + "'

is asking for big trouble. Assuming you're talking to a SQL Server backend, you could do a lot worse than rewriting this to use a parameterized SQLCommand:

http://msdn.microsoft.com/en-us/library/system.data.sqlclient.sqlcommand.aspx[^]

http://www.csharp-station.com/Tutorial/AdoDotNet/lesson03[^]

http://msdn.microsoft.com/en-us/library/system.data.sqlclient.sqlparameter%28v=vs.100%29.aspx[^]

You could also have a look at OleDbCommand or an ORM like Entity Framework or NHibernate.

If you rewrite this to use parameterized input values you're eliminating some of the risk associated with untrusted i.e. user input.