C#关于sqlserver中读取image类型

今天在网上找了许久关于sqlserver中存储image类型和读取image的方法，可是都是那么一点，故在此罗列一下，希望可以帮助大家。
首先是关于dataGridView的绑定。代码见下
private void button_show_Click(object sender, EventArgs e)
{
string sqlText = "server=localhost;initial catalog=Test; integrated security=true";
string sqlstr="select * from tast";
SqlConnection conn=new SqlConnection (sqlText);
conn.Open();
SqlCommand comm = new SqlCommand(sqlstr, conn);
DataSet ds = new DataSet();
SqlDataAdapter da = new SqlDataAdapter();
da.SelectCommand = comm;
da.Fill(ds);
dataGridView1.DataSource = ds.Tables[0];
conn.Close();
}
下面是插入图像到数据库，代码如下：
  private void button_connect_Click(object sender, EventArgs e)
{
string sqlText = "server=localhost;initial catalog=Test; integrated security=true";
string sqlstr = "insert into tast(photo) values(@image) ";
SqlConnection conn = new SqlConnection(sqlText);
conn.Open();
SqlCommand comm = new SqlCommand(sqlstr, conn);
comm.Parameters.Add("@image", SqlDbType.Image).Value = GetPhoto("DSC_6126.JPG");
comm.ExecuteNonQuery();
conn.Close();
}
public byte[] GetPhoto(string str1)
{
string str = str1;
FileStream file = new FileStream(str, FileMode.Open, FileAccess.Read);
byte[]photo=new byte[file.Length];
file.Read(photo,0,photo.Length);
file.Close();
return photo;
}
下面就是读取图片了
private void button_showimg_Click(object sender, EventArgs e)
{
string sqlText = "server=localhost;initial catalog=Test; integrated security=true";
string sqlstr = "select *from tast where whf=1";
SqlConnection conn = new Sql