Failed to convert parameter value from a String to a Int32

即使它在我通过它之前被转换了……

C#代码：

cmd.CommandText = "deleteProd";
int delprodID = Convert.ToInt32(e.CommandArgument.ToString());

Response.Write(delprodID);

cmd.Parameters.Add(new sqlParameter("@prodID",sqlDbType.Int)).Value = delprodID;
cmd.CommandType = CommandType.StoredProcedure;

sqlTools.cmdToNonQuery(cmd)

我的Response.Write显示我在delprodID中有正确的ID.

存储过程：

ALTER PROCEDURE dbo.deleteProd @prodID int
AS
IF @prodID > 0
BEGIN
    DELETE FROM products WHERE prodID = @prodID
END