"Will truncate string or binary data." The statement was terminated. "Error

When you test your program, "the string or binary data will be truncated." The statement was terminated. "Such a mistake, think, should not ah, with a parameterized query, SqlParameter initialization has limited character length, after debugging found that the original C # SqlParameter initialization when the length of characters and SQL Server database length is not the same definition, For example, when we spell the SQL statement, we define the SqlParameter parameter, the length is the new SqlParameter ("@ parameter name", sqldbtype.varchar,50), and the corresponding field in the database is also VarChar (50), But we insert characters into the database can only insert 25 characters or 50 characters, and in the program regardless of character or Chinese characters are counted as a, so when we enter more than 25 Chinese characters, the execution of the INSERT statement, will be called "will truncate string or binary data." The statement was terminated. "Such a mistake.