Textbox Validation using Error Provider in C#

private void Button1_Click(System.Object sender, System.EventArgs e)
{
 
	//CHECKING IF THE TWO TEXTBOXES ARE CLEARED
	if (txtstring.Text == "" && txtnumber.Text == "")
	{
		ErrorProvider1.SetError(txtstring, "Field must be filled up.");
		ErrorProvider1.SetError(txtnumber, "Field must be filled up.");
	}
	else
	{
		//THE ERROR PROVIDER WILL BE CLEARED.
		ErrorProvider1.SetError(txtstring, "");
		ErrorProvider1.SetError(txtnumber, "");
 
		//CONDITION FOR THE STRING VALUE
		//CHECK IF THE INPUT IS A NUMERIC VALUE THEN PERFORM THE ERROR PROVIDER
		//IF NOT, CLEAR THE ERROR PROVIDER.
		if (IsNumeric(txtstring.Text))
		{
			//THE ERROR PROVIDER WILL APPEAR AND WILL NOTIFY THE PROBLEM TO THE USER.
			ErrorProvider1.SetError(txtstring, "Input string value is not valid.");
		}
		else
		{
			//THE ERROR PROVIDER WILL BE CLEARED.
			ErrorProvider1.SetError(txtstring, "");
		}
 
		//CONDITION FOR THE NUMERIC VALUE
		//CHECK IF THE INPUT IS NOT A NUMERIC VALUE THEN PERFORM THE ERROR PROVIDER
		//IF NUMERIC, CLEAR THE ERROR PROVIDER.
		if (!IsNumeric(txtnumber.Text))
		{
			//THE ERROR PROVIDER WILL APPEAR AND WILL NOTIFY THE PROBLEM TO THE USER.
			ErrorProvider1.SetError(txtnumber, "Input numeric value is not valid.");
		}
		else
		{
			//THE ERROR PROVIDER WILL BE CLEARED.
			ErrorProvider1.SetError(txtnumber, "");
		}
 
	}
 
}