Set Value to Select Area object

<td>
<input id="txtEditCampaignId-1513" value="" type="hidden">
<textarea id="txtCampaignName-1513" style="width:350px;height:100px"></textarea>
</td>

The following code identifies text area element and sets value to it.

WebElement CmpTxtArea = driver.findElement(By.xpath("//*[starts-with(@id,'txtCampaignName')]"));
CmpTxtArea.sendKeys("Text Area Success");