如何备份数据Access c#?为什么我的会出现无效的SQL语句？

Question

try
            {
            saveFileDialog1.Filter = "备份文件(*.bak)|*.bak|所有文件(*.*)|*.*";
            saveFileDialog1.InitialDirectory = Application.StartupPath + "\\";
            if (saveFileDialog1.ShowDialog() == DialogResult.OK )
            {
                if(!File.Exists(saveFileDialog1.FileName.ToString()))
                {
                    OleDbConnection con=dataconnetion.dbconnection.oledbconnectin();
                    con.Open();
                    textBox2.Text=saveFileDialog1.FileName.ToString();
                    string strADD="BACKUP DATABASE "+textBox1.Text.Trim()+" TO DISK ='"+saveFileDialog1.FileName.ToString()+"'";
                    OleDbCommand COM=new OleDbCommand (strADD,con);
                  
                    COM.ExecuteNonQuery();
                    con.Close();
                    con.Dispose();
                    MessageBox.Show("备份成功");
                }
              
                else
                {
                    MessageBox.Show("请重新命名");
                }            }

Answer 1

 string strADD="BACKUP DATABASE '"+textBox1.Text.Trim()+"' TO DISK ='"+saveFileDialog1.FileName.ToString()+"'";