diffrence in asp.net in c# and vb

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ASP.NET4

objCmd.CommandType = CommandType.Text
objCmd.CommandText = "{{CALL amits.tst2 (? ?)}}"
Execute iSeries non-stored procedure program call
objCmd.ExecuteNonQuery()

for above vb code is working fine
but for c# is not working please suggest

cmd.CommandType = CommandType.Text;
cmd.CommandText = "CALL AMITS.TST2()";
cmd.ExecuteNonQuery();

it given error ......

SQL0104: Token ? was not valid. Valid tokens: ) ,. Cause . . . . . : A syntax error was detected at token ?. Token ? is not a valid token. A partial list of valid tokens is ) ,. This list assumes that the statement is correct up to the token. The error may be earlier in the statement, but the syntax of the statement appears to be valid up to this point. Recovery . . . : Do one or more of the following and try the request again: -- Verify the SQL statement in the area of the token ?. Correct the statement. The error could be a missing comma or quotation mark, it could be a misspelled word, or it could be related to the order of clauses. -- If the error token is <end-of-statement>, correct the SQL statement because it does not end with a valid clause.