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Conditional Formatting ASP.NET DataGrid Columns

, 21 Apr 2003
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How to format ASP.NET datagrid columns by handling ItemDataBound event at run time.
Prize winner in Competition "ASP.NET Mar 2003"
Sample Image - GridColumnFormatting.gif
<!-- Add the rest of your HTML here -->

Like our previous article, How to remove DataGrid column, this article will try to answer another most frequently asked question about DataGrid controls, how can I conditionally format columns of a data grid control at run time? Believe it or not the answer to this question is very straight forward. When you call DataBind on a DataGrid control or for that matter whenever a grid gets bound to its datasource, ASP.Net framework fires ItemDataBound event. You can add an event handler for this event to take control of the rendering of DataGrid control.

The key to the solution is capturing ItemDataBound event. When the page recieves this event, complete information about the data row is available in DataGridItemEventArgs parameter of the event handler. Item property of this parameter contains information about the table rows and cells that will get rendered on the page. This parameter also contains the information about the DataItem that is being used to render information for the row. The data item corresponds to DataRowView object for that row's data. You can get the value for any given data field based on the field name or zero based index of data column.

For this article we have used the sample Northwind database and bound it to our DataGrid column.

private void OnNWDataBound(object sender, <BR>             System.Web.UI.WebControls.DataGridItemEventArgs e)
{
    if (e.Item.ItemType == ListItemType.Item ||
        e.Item.ItemType == ListItemType.AlternatingItem)
    {
        DataRowView rv = (DataRowView)e.Item.DataItem;
        // Get fourth column value.
        Int32 nUnitsInStock = Convert.ToInt32(rv.Row.ItemArray[4]);
        if (nUnitsInStock < 20)
        {
           e.Item.Cells[4].BackColor = Color.Red;
        }
    }
}
                        

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About the Author

Softomatix
Web Developer
United States United States
To learn more about us, Please visit us at http://www.netomatix.com

Comments and Discussions

 
GeneralMy vote of 5 Pinmembermanoj kumar choubey7-Feb-12 19:26 
Generalbackground image Pinmembermarko jovanovic7-Apr-06 2:14 
QuestionIs there any equivalent situation for WinForms? PinsussAnonymous14-Jun-05 2:41 
Generalmulti Datagrid Pinsusstenzeel.24-Jul-04 1:36 
GeneralHi PinsussAnonymous12-Apr-04 18:58 
GeneralDataGrid formating and Editing data in DataGrid Pinmemberbinmak21-Feb-04 3:06 
QuestionHow this method gets called ? PinmemberInnovatus13-Feb-04 8:07 
AnswerRe: How this method gets called ? Pinmemberthomashungnguyen4-Nov-05 3:08 
GeneralInvalidCastException Pinmemberlewinpj27-Nov-03 2:40 
GeneralChanging a Cells color based on another cells value Pinmembercdwaddell20-Aug-03 2:36 
QuestionHow to create a Scrollable DataGrid with a Fixed Header? Pinsussanonymous14-Jun-03 1:22 
AnswerRe: How to create a Scrollable DataGrid with a Fixed Header? PinmemberSoftomatix17-Jun-03 3:57 
AnswerRe: How to create a Scrollable DataGrid with a Fixed Header? PinsussAnonymous17-Jul-03 9:05 
GeneralRe: How to create a Scrollable DataGrid with a Fixed Header? PinmemberHJvdWijk6-Jan-04 21:28 
GeneralRe: How to create a Scrollable DataGrid with a Fixed Header? Pinmemberreyabreu29-Oct-04 8:58 
AnswerRe: How to create a Scrollable DataGrid with a Fixed Header? PinsussAnonymous28-Oct-04 3:00 
QuestionHow to get width of columns for bounded datagrid Pinmembernitts12-Jun-03 4:06 
AnswerRe: How to get width of columns for bounded datagrid PinmemberSoftomatix12-Jun-03 12:20 
GeneralFormatting actual cell data PinmemberKerry Sanders5-Jun-03 18:07 
GeneralRe: Formatting actual cell data PinmemberSoftomatix12-Jun-03 12:21 
GeneralRe: Formatting actual cell data PinmemberSoftomatix12-Jun-03 12:22 
To be precise it should be ..
 

e.Item.Cells[4].Text = e.Item.Cells[4].Text.ToString(... use your format provider object here ...);
 
---
Softomatix
http://www.netomatix.com
Generalthe color stayed in the same cell after sorted Pinmemberdpthinh21-Apr-03 20:48 
GeneralRe: the color stayed in the same cell after sorted PinmemberSoftomatix22-Apr-03 3:16 

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