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Image1.ImageUrl="Photo.aspx?id="+Request.QueryString["id"];
photo.aspx
int Id=Request.QueryString["id"]==null?0:int.Parse(Request.QueryString["id"].ToString());
using(SqlConnection conn=new SqlConnection())
{
conn.ConnectionString="";
string strSql="select * from A where Id='"+Id+"'";
SqlCommand cmd=new SqlCommand(strSql,conn) ;
conn.Open();
SqlDataReader reader=cmd.ExecuteReader();
if(reader.Read())
{
Response.ContentType = "application/octet-stream";
Response.BinaryWrite((Byte[])reader["Photo"]);
}
Response.End();
}