如何读入ACCESS数据库的备份数据类型～～～

[kevinbxj]

第一发帖，好像我没有分数，希望知道的朋友赐教···
要写到ACCESS数据库表中，可是老是提示数据类型不匹配。
数据库的content字段是备注型的。
protected void Button1_Click(object sender, EventArgs e)
{
String connString = System.Configuration.ConfigurationSettings.AppSettings.Get("dbconnectionstring");
OleDbConnection con = new OleDbConnection(connString);
OleDbCommand dbCommand;
con.Open();
int intCount;

dbCommand = con.CreateCommand();
dbCommand.CommandText = "insert into news_article(content,bigclassid,title,writer,newstime) values(@content,@bigclassid,@title,@writer,@newstime)";
dbCommand.Parameters.Add("@content", OleDbType.LongVarChar).Value = TextBox4.Text.Trim().ToString();
dbCommand.Parameters.Add("@bigclassid", OleDbType.Integer).Value = Convert.ToInt32(TextBox3.Text.Trim());
dbCommand.Parameters.Add("@title", OleDbType.Char, 50).Value = TextBox1.Text.Trim();
dbCommand.Parameters.Add("@writer", OleDbType.Char, 20).Value = TextBox2.Text.Trim();
dbCommand.Parameters.Add("@newstime", OleDbType.DBTimeStamp).Value = System.DateTime.Now; ;

intCount = dbCommand.ExecuteNonQuery();
}