MySQL LOAD DATA INFILE Data too long for column exception

I'm using MySQL LOAD DATA INFILE Data command to bulk insert data to a table. Here's how I am doing it :

LOAD DATA INFILE 'MyFile.csv' INTO TABLE `dbname`.`tablename` FIELDS TERMINATED BY '\t' ENCLOSED BY '"' LINES TERMINATED BY '\r\n' ; 

When I run it from our C# project I'm getting a Data too long for column xxx exception for a char(50) column which the provided data for it is less than 50 (but it is in Persian)but when I use a MySql client such as SQLyog it is working fine.

Here's how I am running this command :

private static void RunCommand(string command,params object[] args)
        {
            if (args != null)
                command = string.Format(command, args);
            using (var conn = MySqlClientFactory.Instance.CreateConnection())
            {
                if (conn == null) return;
                conn.ConnectionString =
                    "Server=localhost;Uid=root;Pwd=123456; AutoEnlist=false;Charset=utf8;";
                conn.Open();
                using (var comm = conn.CreateCommand())
                {
                    comm.CommandText = command;
                    comm.ExecuteNonQuery();
                }
            }
        }

I guess that it could be an issue of converting Unicode characters but I can not figure out how can I make it run correctly.