how to save image to sql server whose data type is varchar(100) and retrive that data?

protected void btnSubmit_Click(object sender, EventArgs e)
  {

      int id = Convert.ToInt32(Session["AgentMasterID"]);
      string temp = "";
      if (fuProducImage.HasFile)
      {
          if (CheckFileType() == true)
          {
              string ext1 = Path.GetExtension(fuProducImage.FileName);
              var query = (from c in agb.AgentProducts orderby c.AgentProductID descending select c.AgentProductID).First();
              int lastid = Convert.ToInt32(query);
              int last = lastid + 1;
              string directoryPath = Server.MapPath("../AgentImages/") + id;
              string vitualp = directoryPath.Replace(@"C:\Users\NET DEVELOPMENT\Desktop\working\AgentWeb", "~").Replace(@"\", "/");
              string filepath = vitualp + "/";
              if (!Directory.Exists(filepath))
              {

                  Directory.CreateDirectory(HttpContext.Current.Server.MapPath(filepath + "/"));
                  fuProducImage.SaveAs(HttpContext.Current.Server.MapPath(filepath + "/" + last + ext1));
                  temp = filepath  + last + ext1;
              }
              else
              {
                  fuProducImage.SaveAs(Server.MapPath(filepath + last + ext1));
                  temp = filepath + last + ext1;
              }
              //fuProducImage.SaveAs(MapPath("~/AgentImages/" + fuProducImage.FileName));
          }
      }
      dmp.Product = txtProduct.Text;
      dmp.AgentMasterID = Convert.ToInt32(Session["AgentMasterID"]);
      dmp.Description = txtDescription.Text;
      dmp.Features = txtFeatures.Text;
      dmp.ProductMRP = Convert.ToDecimal(txtMRP.Text);
      dmp.ProductProfit = Convert.ToDecimal(txtProfit.Text);
      dmp.ProductSellingPrice = Convert.ToDecimal(txtSellingprice.Text);
      dmp.ProductImage = temp;
      //if (!IsPostBack)
      //{
          dmp.InsertAgentproduct();
      //}
      lblPimage.Visible = true;
      lblPimage.Text = "Data Inserted Sucesfully";
      displayproduct();

      txtProduct.Text = "";
      txtProfit.Text = "";
      txtMRP.Text = "";
      txtFeatures.Text = "";
      txtSellingprice.Text = "";
      txtDescription.Text = "";
  }

  bool CheckFileType()
  {
      string ext1 = Path.GetExtension(fuProducImage.FileName);

      switch (ext1.ToLower())
      {
          case ".png":
              return true;
          case ".jpg":
              return true;
          case ".jpeg":
              return true;
          default:
              return false;
      }
  }