Object reference not set to an instance of an object. getting this error.plz help. my code is written below

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C#

public string GetUserRole(ManageUserRole modelManageUserRole)
        {

            object status = new object();

            DataBaseHelper context = new DataBaseHelper();
            SqlParameter[] prm;
            prm = new SqlParameter[] {
                new SqlParameter ("@UserName" , SqlDbType .VarChar),
                new SqlParameter ("@msg" , SqlDbType .VarChar ,100)
            };
            prm[0].Value = modelManageUserRole.userName;

            prm[1].Direction = ParameterDirection.Output;


           status = context.GetReaderWithPrm("usp_GetUserRole", prm);

            string outPutValues = prm[1].Value.ToString();
            return outPutValues;

Posted 10-Feb-14 1:42am

Member 10546331

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OriginalGriff 10-Feb-14 7:47am

Which line gives the error?

Member 10546331 10-Feb-14 7:52am

string outPutValues = prm[1].Value.ToString();
this line is giving the error

Maarten Kools 10-Feb-14 7:53am

Perhaps the status returned by the stored procedure indicates an error occurred. I would assume the Value property remains null, hence the error.

Member 10546331 10-Feb-14 7:53am

string outPutValues = prm[1].Value.ToString();
this line is giving the error

Member 10546331 10-Feb-14 7:53am

string outPutValues = prm[1].Value.ToString();

Karthik_Mahalingam 10-Feb-14 7:56am

what is the error message ?

Member 10546331 10-Feb-14 7:59am

Object reference not set to an instance of an object.

sahabiswarup 10-Feb-14 7:51am

have you tried breakpoint? where you are getting that error?

Member 10546331 10-Feb-14 7:54am

yes string outPutValues = prm[1].Value.ToString(); this line

Member 10546331 10-Feb-14 7:55am

string outPutValues = prm[1].Value.ToString();

2 solutions

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OriginalGriff · Accepted Answer · 2014-02-10T02:03:00

string outPutValues = prm[1].Value.ToString();

this line is giving the error

Well...I'm not surprised...

C#

prm = new SqlParameter[] {
    new SqlParameter ("@UserName" , SqlDbType .VarChar),
    new SqlParameter ("@msg" , SqlDbType .VarChar ,100)
};
prm[0].Value = modelManageUserRole.userName;
prm[1].Direction = ParameterDirection.Output;
status = context.GetReaderWithPrm("usp_GetUserRole", prm);
string outPutValues = prm[1].Value.ToString();

You don't assign any value to the Value property of prm[1], so when you try to call ToString, it's working from a null value, and you get the exception.
If your context.GetReaderWithPrm method is calling a stored procedure which returns a value via the parameter, then you need to set it as an Output parameter in order to get values back.

Otherwise, check your method and see what it does with the parameters and if it modifies them in any way.

Karthik_Mahalingam · Accepted Answer · 2014-02-10T02:24:00

Solution 2

try this

~~string outPutValues = prm[1].Value.ToString();~~

C#

string outPutValues = Convert.ToString(prm[1].Value);
       // or
       string outPutValues = prm[1].Value + "";

Posted 10-Feb-14 2:24am

Karthik_Mahalingam

Comments

Member 10546331 10-Feb-14 8:36am

thanks it worked...bt i want userrole to be returned ...my stored proc is
ALTER PROCEDURE [dbo].[usp_GetUserRole]
@UserName varchar(100),@msg varchar(100) output

AS
declare @countusername int
BEGIN
begin tran
select @countusername = COUNT (*) from tm_User where UserName = @UserName
if(@countusername = 0)
begin
select @msg = 'User does not exist'
end
else
select UserRole from tm_User where UserName = @UserName

COMMIT TRAN
END this is my stored procedure

Karthik_Mahalingam 10-Feb-14 8:42am

select @msg = 'User does not exist'
end
else
select UserRole from tm_User where UserName = @UserName
select @msg = UserRole from tm_User where UserName = @UserName

Member 10546331 10-Feb-14 10:35am

still it is not returning any role...

Karthik_Mahalingam 10-Feb-14 13:45pm

can u post full sql code.

Member 10546331 11-Feb-14 0:26am

ALTER PROCEDURE [dbo].[usp_GetUserRole]
@UserName varchar(100),@msg varchar(100) output

AS
declare @countusername int
BEGIN
begin tran
select @countusername = COUNT (*) from tm_User where UserName = @UserName
if(@countusername = 0)
begin
select @msg = 'User does not exist'
end
else
select UserRole from tm_User where UserName = @UserName

COMMIT TRAN
full sql code

Karthik_Mahalingam 11-Feb-14 0:52am

ALTER PROCEDURE [dbo].[usp_GetUserRole]
@UserName varchar(100),@msg varchar(100) output

AS
declare @countusername int
BEGIN
begin tran
select @countusername = COUNT (*) from tm_User where UserName = @UserName
if(@countusername = 0)
begin
select @msg = 'User does not exist'
end
else

select @msg = UserRole from tm_User where UserName = @UserName
select UserRole from tm_User where UserName = @UserName

COMMIT TRAN