asp.net - add sub into vb.net happen connection strings property has not been initialized -


i have found lot of solution regarding connection strings property has not been initialized, have try follow , checking solution still not able fix problems.

it happen while add private sub getdetails(), if remove sub recover. not happen other private sub this. 

private sub getorglocedit()     dim strsql string     dim params new hashtable     dim dt new datatable      try         params.clear()          strsql = "select c.mmc_states + ' - ' + c.mmc_desti desti [database].[dbo].[tbods] o " & _             " inner join [database].[dbo].tbodsmealmilageclaims c " & _             " on o.ods_destination = c.mmc_states + ' - ' + c.mmc_desti " & _             " c.mmc_company = @company , o.ods_id = @id order c.mmc_states, c.mmc_desti "          params.add("@company", ddlcompany.selectedvalue.trim)         params.add("@id", txtid.text.trim)          if dt.rows.count > 0             ddlorgloc.datasource = dt             ddlorgloc.datatextfield = "desti"             ddlorgloc.datavaluefield = "desti"             ddlorgloc.databind()         else             ddlorgloc.items.clear()         end if          common.execreadergreen(strsql, params, dt, common.txn)      catch ex exception         throw ex     end try end sub

connection string:

<add name="connstringgreen" connectionstring="data source=servername;database=database;persist security info=true; user id=user;password=password" providername="system.data.sqlclient" />

openconn method:

public sub openconn()     try         'portal connection===========         conn.connectionstring = configurationmanager.connectionstrings("connstringgreen").connectionstring         if not conn nothing             if conn.state = data.connectionstate.closed                 conn.open()             end if         else             throw new exception("can't connect portal sql server!")         end if

do this:

   conn.connectionstring =     configurationmanager.connectionstrings("connstringgreen")

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