Server Error in '/' Application.

Value cannot be null.
Parameter name: connectionString

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.ArgumentNullException: Value cannot be null.
Parameter name: connectionString

Source Error:


Line 814:                                                   ByVal ParamArray parameterValues() As Object) As SqlDataReader
Line 815:        If (connectionString Is Nothing OrElse connectionString.Length = 0) Then Throw New ArgumentNullException("connectionString")
Line 816:        If (spName Is Nothing OrElse spName.Length = 0) Then Throw New ArgumentNullException("spName")
Line 817:
Line 818:        Dim commandParameters As SqlParameter()

Source File: E:\AnhANBLD\PLLD_Moblie\App_Code\SQLHelper.vb    Line: 816

Stack Trace:


[ArgumentNullException: Value cannot be null.
Parameter name: connectionString]
   SqlHelper.ExecuteReader(String connectionString, String spName, Object[] parameterValues) in E:\AnhANBLD\PLLD_Moblie\App_Code\SQLHelper.vb:816
   Data.DanhMuc.HanhChinh.GetAll_Tinh(String conn) in E:\AnhANBLD\PLLD_Moblie\App_Code\clsDanhmuc.vb:230
   _Default.fill_combo_Tinh(DropDownList cb) in E:\AnhANBLD\PLLD_Moblie\statistical1.aspx.vb:179
   _Default.Page_Load(Object sender, EventArgs e) in E:\AnhANBLD\PLLD_Moblie\statistical1.aspx.vb:33
   System.Web.UI.Control.OnLoad(EventArgs e) +106
   System.Web.UI.Control.LoadRecursive() +68
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +3785


Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.7.4063.0