Web Technologies

Introduction

This article is for beginners who want to learn how to upload images.

Step 1

First add the following HTML tag :-

<input id="Upload" style="Z-INDEX: 102; LEFT: 104px; WIDTH: 288px;
POSITION: absolute; TOP: 64px; HEIGHT: 22px" type="file"
size="28" name="Upload" runat="server"> 

This control will upload your image.

Step 2

Create a Button called "Upload" and another called "LoadImage". Add the DataGrid and do required bindings.

Step 3

Lets see some sample code now.

    private void Button1_Click(object sender, System.EventArgs e)
 {
     //It verifies if the archive exists

     if (Upload.PostedFile != null)
     {
         //To create a PostedFile

         HttpPostedFile File = Upload.PostedFile;

         //Create byte Array with file len

         byte[] Data = new Byte[File.ContentLength];
         //force the control to load data in array

         File.InputStream.Read(Data,0,File.ContentLength);
          
         int i = 0;

         //Dysplay array data in textbox

         for (i=0;i//Create procedure parameter

         object[] obj = new object[1];

         obj[0] = Data;

         //Execute the procedure with Microsoft.ApplicationBlocks.Data

         //Simple procedure

         /*CREATE PROCEDURE sp_img(@img image)  AS

         insert into tb_img values(@img)*/

         //record data

         SqlHelper.ExecuteNonQuery(connectionString,"sp_img",obj);    

     }
 }

 private void Button2_Click(object sender, System.EventArgs e)
 {
     //Bind data to your grid

     //more details consulting

     //Working DataGrid TemplateColumns and Bind this Columns

     DataSet ds = SqlHelper.ExecuteDataset(connectionString,
         "sp_load_img",null);
     grid.DataSource  = ds.Tables[0].DefaultView;
     grid.ObjectName = "Image1";
     grid.FieldName = "img";
     grid.Editable = false;
     grid.DataBind();
     grid.DataBindObjects(grid,ds,0,grid.PageSize);

     int i =0;

     for (i=0;i0].Rows.Count;i++)
     {
                     //test your bitmap is valid

                     //Demonstration

         byte[] bits = (byte[]) ds.Tables[0].Rows[i]
             ["img"];
         MemoryStream memorybits = new MemoryStream(bits);
         Bitmap bitmap = new Bitmap(memorybits);
     }


 }

 private void grid_PageIndexChanged(object source,
        System.Web.UI.WebControls.DataGridPageChangedEventArgs e)
 {
     //Page your grid

     //Bind data to your grid

     //more details consulting

     //Working DataGrid TemplateColumns and Bind this Columns

     grid.CurrentPageIndex =e.NewPageIndex;
     DataSet ds = SqlHelper.ExecuteDataset(connectionString,
         "sp_load_img",null);
     grid.DataSource  = ds.Tables[0].DefaultView;
     grid.ObjectName = "Image1";
     grid.FieldName = "img";
     grid.Editable = false;
     grid.DataBind();
     grid.DataBindObjects(grid,ds,e.NewPageIndex,grid.PageSize);
  
 }
}

Labels: ASP.Net, Image, image upload

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