general method to clearform in asp.net?

I am using master page with content pages. I want to write a genral me开发者_如何转开发thod to clear textboxes and for dropdownlist set index to 0. Please guide on this.

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A Server-Side Approach

If you want to clear the TextBoxes and DropDownLists on postback, you could recurse through the page's Controls collection and for each control see if it's a TextBox or DropDownList. Here's such a function in C#:

void ClearInputs(ControlCollection ctrls)
{
    foreach (Control ctrl in ctrls)
    {
        if (ctrl is TextBox)
            ((TextBox)ctrl).Text = string.Empty;
        else if (ctrl is DropDownList)
            ((DropDownList)ctrl).ClearSelection();

        ClearInputs(ctrl.Controls);
    }
}

To use this you'd call ClearInputs passing in the control collection you want to search. To clear out all TextBoxes and DropDownLists on the page you'd use:

ClearInputs(Page.Controls);

A Client-Side Approach

An alternative tactic would be to use a client-side approach. Namely, use JavaScript to recurse through the DOM and clear/reset the textboxes and drop-downs on this page. The following JavaScript uses the jQuery library to simplify things:

function clearElements() {
    $("input[type=text]").val('');
    $("select").attr('selectedIndex', 0); 
}

In a nutshell, it sets the value of all <input type="text" ... /> elements on the page to an empty string and sets the selectedIndex attribute of all <select> elements on the page to 0. I've created a script on JSFiddle.net to let you try out the script: http://jsfiddle.net/xs6G9/

For More Information

I wrote a blog entry on this topic with more information and discussion. See: Resetting Form Field Values in an ASP.NET WebForm.

Happy Programming!

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<input type="reset"> is a simple solution client side.