NO PREVIEW AVAILABLE IN MY IMAGE

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VB

HI EXPERTS

I am saving a blob image in my local drive using filestream. Image available in the database will be in a proper manner. After saving i can't able to see the preview available in the image it is showing
"NO PREVIEW AVAILABLE"

Below is the code i am using

Dim filepath As String = "d:/"
            filepath = filepath + Now.Second.ToString() & ".BMP"

 Dim fs As New FileStream(filepath, FileMode.Create, FileAccess.ReadWrite)
            Dim blob As Byte() = CType(dt.Rows(0).Item(0), Byte())
            fs.Write(blob, 0, blob.Length)
 fs.Close()

Kindly provide your feedback.

Rgds
Jagadesh