how to update and insert images by fileupload control in asp.net c#

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C#

Please someone tell that how to insert and upload images by fileupload control in asp.net c#, I am able to insert the images, but updation is not happening, this is my code, which is insert images

SqlCommand cmd = new SqlCommand();
                cmd.CommandText = "INSERT INTO Images(ImageName,Image) VALUES (@ImageName,@Image)";
                cmd.CommandType = CommandType.Text;
                cmd.Connection = con;
                SqlParameter ImageName = new SqlParameter("@ImageName", SqlDbType.VarChar, 50);
                ImageName.Value = strImageName.ToString();
                cmd.Parameters.Add(ImageName);

Please, someone tell how to update images by same kind of code in asp.net c#


thanks