C# :: How To Insert Decimal Values In MySQL Database

i wanted to insert Decimal Values in MySQL database, but decimal values has precision and in C# there is not option to specify precision point, the last column is size which is integer.

MySqlParameter MySqlParameterCollection.Add(string parameter Name,MySqlDBTYPE dbType,int size);

Here my Code and i get error on last Line

MySqlCommand insert = new MySqlCommand("Insert into
Plan(Plan_ID,Plan_Title,Plan_rate,Plan_Length)
values(@p_id,@p_t,@p_r,@p_l);", con);
insert.Parameters.Add("@p_id", MySqlDbType.VarChar, 10).Value = p.p_id;
insert.Parameters.Add("@p_t", MySqlDbType.VarChar, 45).Value = p.p_title;
insert.Parameters.Add("@p_r", MySqlDbType.Decimal,10,2)=p.p_rate;