You can try to use the next approaches, in this case, to paste text on Java or C#:
using Selenium Send Keys C#
public void PasteText(IWebElement element, string text)
{
Clipboard.SetText(text);
element.Click();
Thread.Sleep(100);
element.SendKeys(OpenQA.Selenium.Keys.Control + "a" + OpenQA.Selenium.Keys.Delete);
Thread.Sleep(100);
element.SendKeys(OpenQA.Selenium.Keys.Control + "v");
}
using Selenium Send Keys Java
public void pasteText(WebElement element, String text)
{
Clipboard clipboard = Toolkit.getDefaultToolkit().getSystemClipboard();
StringSelection stringSelection = new StringSelection(text);
clipboard.setContents(stringSelection, null);
element.click();
Thread.sleep(100);
element.sendKeys(Keys.chord(Keys.CONTROL, "a"));
element.sendKeys(Keys.Delete);
Thread.sleep(100);
element.sendKeys(Keys.chord(Keys.CONTROL, "v"));
}
using InputSimulator library C#
public static void PasteText(IWebElement element, string text)
{
Clipboard.SetText(text);
element.Click();
Thread.Sleep(100);
var inSim = new WindowsInput.InputSimulator();
inSim.Keyboard.ModifiedKeyStroke(VirtualKeyCode.CONTROL, VirtualKeyCode.VK_A);
inSim.Keyboard.KeyDown(VirtualKeyCode.DELETE);
Thread.Sleep(100);
inSim.Keyboard.ModifiedKeyStroke(VirtualKeyCode.CONTROL, VirtualKeyCode.VK_V);
inSim.Keyboard.KeyDown(VirtualKeyCode.RETURN);
}
using Robot library Java
public void pasteText(WebElement element, String text)
{
Clipboard clipboard = Toolkit.getDefaultToolkit().getSystemClipboard();
StringSelection stringSelection = new StringSelection(text);
clipboard.setContents(stringSelection, null);
element.click();
Thread.sleep(100);
Robot robot = new Robot();
robot.keyPress(KeyEvent.VK_CONTROL);
robot.keyPress(KeyEvent.VK_A);
robot.keyRelease(KeyEvent.VK_A);
robot.keyRelease(KeyEvent.VK_CONTROL);
robot.keyPress(KeyEvent.VK_DELETE);
robot.keyRelease(KeyEvent.VK_DELETE);
Thread.sleep(100);
robot.keyPress(KeyEvent.VK_CONTROL);
robot.keyPress(KeyEvent.VK_V);
robot.keyRelease(KeyEvent.VK_V);
robot.keyRelease(KeyEvent.VK_CONTROL);
robot.keyPress(KeyEvent.VK_RETURN);
robot.keyRelease(KeyEvent.VK_RETURN);
}