C＃错误（对象引用不设置为一个对象的一个​​实例。）

Question

误差图像http://i.stack.imgur.com/AC5sE.png

我想添加数据到DATAZ但发现错误时生成

这是我的代码

int i = 0; 
string[][,] dataz = null; 
conn.Open(); 

OleDbCommand db = conn.CreateCommand(); 
db.CommandType = CommandType.Text; 
db.CommandText = "select name,img from [building] order by id asc "; 

OleDbDataReader oReader = db.ExecuteReader(); 


while (oReader.Read()) 
{ 

     string name = oReader.GetString(0); 
     string img = oReader.GetString(1); 
     dataz[i] = new string[,] { { "name", name }, { "img", img } }; 
     i++; 

} 
conn.Close(); 

Answer 1

使用LINQ to SQL的

var data = 
    ctx.Buildings.OrderBy(x => x.id).Select(x => new { x.name, x.img }).ToArray();