in sql the type of image is image. now follow the below code
cmd = New SqlCommand("INSERT INTO image VALUES(@name,@photo)", conn)
cmd.Parameters.AddWithValue("@name", TextBox1.Text)
Dim ms As New MemoryStream()
PictureBox1.BackgroundImage.Save(ms, PictureBox1.BackgroundImage.RawFormat)
Dim data As Byte() = ms.GetBuffer()
Dim p As New SqlParameter("@photo", SqlDbType.Image)
p.Value = data
cmd.Parameters.Add(p)
cmd.ExecuteNonQuery()