Question

The coding like

decimal prodprice = Convert.ToDecimal(NavigationContext.QueryString["Price"]);

then what should i put for

Binary image = Convert.ToByte(NavigationContext.QueryString["Image"]);

I had error at Convert.ToByte.

Answer 1

I am just going to assume you get your “Image” querystring as a Hex string (0-F digits). If so, you can convert it into a byte array first. An example (not the most efficient one but it should work):

string data = "0A0B0C0F1102"; // example data
if (data.Length % 2 != 0) { data = "0" + data; } 

byte[] result = new byte[data.Length / 2];
for (int i = 0; i < data.Length; i += 2) {
    result[i/2] = Convert.ToByte(data.Substring(i, 2), 16);
}
Binary image = result;