C#的SQL參數化查詢 防止SQL注入

 OleDbCommand insertCom=new OleDbCommand();
insertCom.CommandText= "insert into insurance(name,specify,yearnumber,typeworkid,sumorwin) values(?,?,?,?,?) ";
insertCom.Parameters.Add(new OleDbParameter( "@name ",OleDbType.VarChar,100, "name "));
insertCom.Parameters.Add(new OleDbParameter( "@specify ",OleDbType.VarChar,100, "specify "));
insertCom.Parameters.Add(new OleDbParameter( "@yearnumber ",OleDbType.Integer,100, "yearnumber "));
insertCom.Parameters.Add(new OleDbParameter( "@typeworkid ",OleDbType.VarChar,50, "typeworkid "));
insertCom.Parameters.Add(new OleDbParameter( "@sumorwin ",OleDbType.VarChar,10, "sumorwin "));
insertCom.Parameters[0].Value=txtBox1.Text.Trim();
insertCom.Parameters[1].Value=txtBox2.Text.Trim();
insertCom.Parameters[2].Value=int.Parse(txtBox3.Text.Trim());
insertCom.Parameters[3].Value=typeworkid;
insertCom.Parameters[4].Value=cmBox2.Text;

insertCom.Connection=oleCon;
if(oleCon.State==System.Data.ConnectionState.Closed)
{
oleCon.Open();
}
insertCom.ExecuteNonQuery();