How can I call a SQL function in C#?

Question

I have created a function in SQL, now I need to use that function in my C# application.

I tried using something like this, but it seems I'm doing it wrong since I'm getting:

Must declare the scalar value '@2064734117'

...when I give 2064734117 as the first parameter and 1 as the second parameter. Here is the code I'm talking about:

SqlConnection con = new SqlConnection(clsDb.connectionString);
string query = string.Format("select Function1(@{0},@{1}) ",
  int.Parse(e.CurrentRow.Cells["CodeMeli"].Value.ToString()),1);
con.Open();
SqlCommand cmd = new SqlCommand(query,con);
SqlDataAdapter READER = new SqlDataAdapter();
READER.SelectCommand = cmd;
DataTable table = new DataTable();
READER.Fill(table);
radGridView1.DataSource = table;
con.Close();

And my function takes two integer parameters and returns a table. I checked it in Visual Studio and it worked, but I couldn't get it to work in my application.

And this is my function declaration:

ALTER FUNCTION dbo.Function1
(
/*
@parameter1 int = 5,
@parameter2 datatype
*/
@ID int,
@clsTypeID int
)
    RETURNS TABLE/* @table_variable TABLE (column1 datatype, column2 datatype) */
    AS
         /*BEGIN */
    /* INSERT INTO @table_variable
       SELECT ... FROM ... */
RETURN SELECT  * FROM tblCLASS2 
        WHERE STNID = @ID AND CLASSTYPEID =  @clsTypeID  
/*END */
/*GO*/

Answer 1

Your SQL is a bit off, it should be:

  string query = string.Format("select * from dbo.Function1({0},{1});", int.Parse(e.CurrentRow.Cells["CodeMeli"].Value.ToString()),1);

You might want to use SqlParameter-objects to prevent sql injections:

  string query = "select * from dbo.Function1(@pa1,@par2);";
  cmd.Parameters.Add("@par1", SqlDbType.Int).Value = int.Parse(e.CurrentRow.Cells["CodeMeli"].Value.ToString());  
  cmd.Parameters.Add("@par2", SqlDbType.Int).Value = 1;