How to display t-sql aggregate function result on windows form using c#

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Hi Everyone,

I am trying to display the result of T-SQL aggregate function(e.g. sum) on a windows form using C# but I'm getting errors. could anybody help. below is the codes I've tried.

What I have tried:

C#

string selectcom1=select sum(Inv),StaffNumber, DATEPART(year,Date)  from Grawu  where datepart(YEAR,[Date])='2015'
group by StaffNumber, DATEPART(YEAR,[Date])

SqlCommand comm1 = new SqlCommand(selectcom1, connection);
 comm1.CommandType = CommandType.StoredProcedure;
 comm1.Parameters.AddWithValue("@year", cmbyear.SelectedItem);

SqlDataReader dr1 = comm1.ExecuteReader();
   if (dr1.Read())
       {
        year = dr1["year"].ToString();
                             
        Messagebox.Show("Anwer"+ dr1["inv"].ToString());

       }

Posted 22-Feb-16 10:53am

sisey shaban

Updated 22-Feb-16 11:48am

Maciej Los

v2

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Maciej Los 22-Feb-16 17:06pm

You missed ["] double quotes around select statement:

string selectcom1=@"select sum(Inv),StaffNumber, DATEPART(year,Date)  from Grawu  where datepart(YEAR,[Date])='2015'
group by StaffNumber, DATEPART(YEAR,[Date])";

You forgot to define parameter for inside select statement.

sisey shaban 22-Feb-16 17:47pm

Thanks Maceij, but that isn't the problem. the problem is the aggregate function(e.g. sum(inv)) displays better on management studio but not on windows form. I think I'm missing something. thanks again.

Maciej Los 22-Feb-16 17:49pm

Please, see my answer.

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Maciej Los · Answer 1 · 2016-02-22T11:48:00

Please, read my comment to the question.

Check this:

C#

string selectcom1=@"select sum(Inv) As SumOfInv, StaffNumber, YEAR([Date]) AS Year
FROM Grawu 
WHERE YEAR([Date])=@year
GROUP BY StaffNumber, YEAR([Date])";

The rest of your code, you should change respectivelly to the MSDN documentation:
SqlCommand.CommandType Property (System.Data.SqlClient)[^]
Configuring Parameters and Parameter Data Types[^]
SqlCommand.ExecuteReader Method (System.Data.SqlClient)[^]
Retrieving Data Using a DataReader[^]