Unable to cast object of type 'System.String' to type 'System.Byte[]'.

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C#

Hi
I'm getting the above error while trying to get the image from the table.

Here is my code

protected void Page_Load(object sender, EventArgs e)
   {
       string id = Request.QueryString["id"].ToString();

       SqlCommand cmd = new SqlCommand("select photoName from registration where Id='" +id + "'", con);
       con.Open();
       SqlDataReader rdr = cmd.ExecuteReader();
       while (rdr.Read())
           {
               byte[] byteArr = (byte[])rdr["PhotoName"];
               Response.BinaryWrite(byteArr);

           }

       rdr.Close();
       con.Close();
   }

Getting error near

<b>   byte[] byteArr = (byte[])rdr["PhotoName"];</b>

while Executing the code .

Please help me solve this.

Thanks in Advance.