if (objFileUpload.PostedFile !=null)
{
          if (objFileUpload.PostedFile.ContentLength > 0)
         {
              // Get Posted File.
          HttpPostedFile objHttpPostedFile = objFileUpload.PostedFile;

          // Check valid Image type. Create this function according to your need
                  if (CheckValidFileType(objHttpPostedFile.FileName))
                 {
                        // Find its length and convert it to byte array
                        int intContentlength = objHttpPostedFile.ContentLength;

                       // Create Byte Array 
                        Byte[] bytImage =new Byte[intContentlength];
                           
                        // Read Uploaded file in Byte Array
        objHttpPostedFile.InputStream.Read(bytImage,0,                                intContentlength);
                                      
                   }
              }

        }


       Pass this Byte array to you DAL and use it for storing image in database. 

 
Database db =DatabaseFactory.CreateDatabase();

string sqlCommand =“StoredProcedureName”;

DbCommand dbCommandWrapper = db.GetStoredProcCommand(sqlCommand);

db.AddInParameter(dbCommandWrapper,“@Image”,DbType.Binary,bytImage );

try
{
             db.ExecuteNonQuery(dbCommandWrapper);
}
catch {throw; }

 
      This is how you can store the Image in database. Retrieving the image is the same process. Write a SP which will return your image. Store this value in a Byte Array. Once you get the image in Byte array, write it on form as shown below,

 
Byte[] bytImage =Byte array retrieved from database.
if (bytImage !=null)
{
          Response.ContentType =“image/jpeg”;
          Response.Expires = 0; Response.Buffer =true;
          Response.Clear();
          Response.BinaryWrite(bytImage); 
          Response.End();
}

<asp:Image ID=”ViewImage” runat=”server” />

string strURL =“~/ViewImage.aspx?ID= 1 “ ;
ViewImage.ImageUrl = strURL;