Question

I am doing a C# project and I have the following scenario:

The first is for the month, the second is for the year and a button by the side. I also have a table which contains two columns named date (datatype small datetime) and price (varchar).

I have generated this but it errors with “Invalid column name ‘yourMonthSelected’ and
“Invalid column name ‘yourYearSelected'”.
is my approach the right way?

Answer 1

I think you query text is wrong. You tried to add yourMonthSelected and yourYearSelected as a parameter in your query, but you didn’t specify them in your query with @yourMonthSelected and @yourYearSelected.

Try this query;

string intero = "select sum(no_of_mobiles) from table2 where datepart(mm,given_schedule)= @yourMonthSelected and datepart(yy,given_schedule)= @yourYearSelected";

Look at AddWithValue method and check how you can use it. And you can write;

SqlDataReader rdr = cmd.ExecuteReader();

instead of

SqlDataReader rdr;
rdr = cmd.ExecuteReader();

Which they are exactly same but first one looks better. Also in your while clause, you should use rdr[0] instead of rdr, because rdr is an array. Like this;

while (rdr.Read())
{
     label2.Text = rdr[0].ToString();
}