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ASP.NET - Drag and Drop on a Webpage

, 28 Dec 2004
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Drag and drop contained objects on a webpage.


Many web applications are required to be complex yet intuitive to the user. One way to achieve this is to create objects or areas of the web page draggable and droppable. Unfortunately, ASP.NET server controls do not have the Drag events and DragEventArgs. Fortunately, there is a way to enable drag and drop functionalities within a web page. Now keep in mind, this is not like a Windows application where you can drag files from the user's PC to the application. The drag and drop is limited to the boundaries of the web page.

Using the code

  1. Create a web application within your solution.
  2. Create a web page.
  3. Add the provided JavaScript in the <HEAD> of your <HTML>.
  4. Add two textboxes and a button in the web form.
  5. Add the DrawContainers method to the code-behind of the web page.
  6. Ensure that the click event for the button calls the DrawContainers method.


  • Download the source code and run the sample application.


This is the JavaScript that enables the drag and drop to take place:

<!--<span class="code-comment">------- Drag and Drop JavaScript ------------></span>

C# code behind - DrawContainers method

This is the code behind used to create the drag and drop objects:

private void DrawContainers()
    TableRowCollection trCol = this.Table1.Rows;
    TableRow tr = null;
    // Should we continue?
    if(this.txtContX.Text == null || this.txtContY.Text == null)
    // Size of the row.
    int rowSize = Int32.Parse(this.txtContX.Text); 
    // Number of rows.
    int rowNumber = Int32.Parse(this.txtContY.Text);
    // Total number of containers.
    int numberOfContainers = rowSize * rowNumber;
    // Boolean value for empty table cells.
    bool isEmpty = false;
    // Loop through all of the containers.
    for(int i=0; i< numberOfContainers; i++)
        // new row mod.
        int newRow =  i % rowSize;
        // Should we create a new row?
        if(tr == null || newRow == 0)
            tr = new TableRow();

        // Empty cell generator.
            isEmpty = true;
            isEmpty = false;

        // Set the cell collection.
        TableCellCollection tdc = tr.Cells;

        // Create a new table cell.
        TableCell td = new TableCell();
        td.ID = "cell_" + i.ToString();
        // Set the cell backcolor.
        td.BackColor = Color.Turquoise;
        // Set the cell's class.
        td.CssClass = "SpecimenLoc";

        td.Attributes.Add("SpecimenId", "");

        // Is the cell empty?
            td.Attributes.Add("SpecimenId", i.ToString());
            td.BackColor = Color.Beige;
            td.Text = i.ToString();
        // Add javascript attributes to the cell.
        td.Attributes.Add("target", "true");
        td.Attributes.Add("onmousedown", "BeginDrag(;");
        td.Attributes.Add("onmouseup", "CancelDrag();"); 
        td.Width = Unit.Pixel(35);
        td.Height = Unit.Pixel(35);

        // Add the cell to the cell collection.

C# code behind - button click event

The click event of the button:

private void btnDrawContainers_Click(object sender, System.EventArgs e)
    // Draw the containers.


This article has no explicit license attached to it but may contain usage terms in the article text or the download files themselves. If in doubt please contact the author via the discussion board below.

A list of licenses authors might use can be found here


About the Author

Kenny Young
United States United States
No Biography provided

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Comments and Discussions

GeneralMy vote of 5 Pin
manoj kumar choubey9-Feb-12 22:13
membermanoj kumar choubey9-Feb-12 22:13 
QuestionExplaination Pin
sakshictr10-Jan-12 20:34
membersakshictr10-Jan-12 20:34 
QuestionNeed some Suggestions. Pin
supriya_rani2013-Sep-11 0:37
membersupriya_rani2013-Sep-11 0:37 
GeneralMy vote of 1 Pin
Member 449609922-Jun-09 21:55
memberMember 449609922-Jun-09 21:55 
GeneralGood Article Pin
khanjee7730-Dec-08 18:30
memberkhanjee7730-Dec-08 18:30 
GeneralMy vote of 2 Pin
Iyigun Cevik8-Dec-08 3:47
memberIyigun Cevik8-Dec-08 3:47 
Generalhii kenny Young Pin
ctcalyx6-Aug-07 22:06
memberctcalyx6-Aug-07 22:06 
GeneralRe: hii kenny Young Pin
Rockrebel7-Aug-08 2:42
memberRockrebel7-Aug-08 2:42 
GeneralRe: hii kenny Young Pin
Kenny Young7-Aug-08 3:26
memberKenny Young7-Aug-08 3:26 
QuestionHyperLinkBitmap Error Pin
diddy4332-Jul-07 7:39
memberdiddy4332-Jul-07 7:39 
GeneralDoens't work with firefox Pin
carlintveld31-May-07 8:50
membercarlintveld31-May-07 8:50 
GeneralRe: Doens't work with firefox Pin
vytas z.16-Aug-07 3:33
membervytas z.16-Aug-07 3:33 
GeneralRe: Doens't work with firefox Pin
bbol19-Nov-07 13:49
memberbbol19-Nov-07 13:49 
Except that this may have been created for a client that mandates that IE is used to run this as an internal application. I wouldn't be so quick to judge there v, just because it is useless to you does not mean that it is useless.

GeneralDoes n't Work with ASP.Net 2005 Pin
Hari Darshan26-Apr-07 2:17
memberHari Darshan26-Apr-07 2:17 
QuestionHow to get updated row after drag? Pin
davihigh12-Sep-06 4:29
memberdavihigh12-Sep-06 4:29 
AnswerRe: How to get updated row after drag? Pin
Kenny Young12-Sep-06 8:15
memberKenny Young12-Sep-06 8:15 
QuestionCheckbox. Pin
py1rdj4-Sep-06 12:20
memberpy1rdj4-Sep-06 12:20 
AnswerRe: Checkbox. Pin
Kenny Young12-Sep-06 8:17
memberKenny Young12-Sep-06 8:17 
QuestionDrag n Drop from listbox to a datagrid Pin
kumarcs4-Sep-06 5:11
memberkumarcs4-Sep-06 5:11 
AnswerRe: Drag n Drop from listbox to a datagrid Pin
Kenny Young12-Sep-06 8:21
memberKenny Young12-Sep-06 8:21 
GeneralDatagrid to Datagrid drag drop Pin
sandeepautade31-Aug-06 3:31
membersandeepautade31-Aug-06 3:31 
GeneralRe: Datagrid to Datagrid drag drop Pin
Kenny Young31-Aug-06 3:39
memberKenny Young31-Aug-06 3:39 
GeneralDRAG DROP Pin
Mon217-Aug-06 21:45
memberMon217-Aug-06 21:45 
GeneralRe: DRAG DROP Pin
Kenny Young31-Aug-06 3:37
memberKenny Young31-Aug-06 3:37 
Generalmicrosoft treeview [modified] Pin
azidi13-Jul-06 15:37
memberazidi13-Jul-06 15:37 

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