string strSql = "select top 1 picture from M_StitchType where StitchType='100'";
DataTable dt = new DataTable();
SqlDataAdapter da=new SqlDataAdapter(strSql,"数据库连接字符串")
da.fill(dt);
if (dt.rows[0][0]!=null)
{MessageBox.Show("NO pictue");}
好象不行,请问这个判断条件怎样写?
是用==
C#中那DBNull和null有何区别?