Hi, I'm getting an exception "Input string was not in a correct format." This happens only when any of the textbox is left empty that means when i click radioCircle on the form and only enter Radius value and leave all other textboxes empty then i get that error. But if i fill all the other text boxes and then click on radioCircle then it don't give any error and gives correct result for radius of circle only.
Same is when i tried to disable txtL.ReadOnly = true; and txtW.ReadOnly = true; upon checking event of Circle radio it again gave the same exception that code of making textboxes ReadOnly is now commented you can see. i don't get it why its giving me error on being empty textboxes or on ReadOnly please if any one can explain in a bit detail thanks in advance. Code is given. I searched and found Tryparse but this ain't working for me here is the code.
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
namespace menu
{
public partial class Form1 : Form
{
private int exp ;
public Form1()
{
InitializeComponent();
}
private void btnResult_Click(object sender, EventArgs e)
{
float length = float.Parse(txtL.Text);
float.TryParse(txtL.Text, out length);
float width = float.Parse(txtW.Text);
float.TryParse(txtW.Text, out width);
float radius = float.Parse(txtR.Text);
float.TryParse(txtR.Text, out radius);
float tribase= float.Parse(txtB.Text);
float.TryParse(txtB.Text, out tribase);
float height = float.Parse(txtH.Text);
float.TryParse(txtH.Text, out height);
float area = 0;
switch(exp){
case 1:
area = 3.14f* radius * radius;
txtResult.Text = area.ToString();
break;
case 2:
area = length * width;
txtResult.Text = area.ToString(); 
break;
case 3:
area = (tribase * height) / 2;
txtResult.Text = area.ToString();
break;
}
}
private void radioCircle_CheckedChanged(object sender, EventArgs e)
{
txtL.ReadOnly = true;
txtW.ReadOnly = true;
txtH.ReadOnly = true;
txtB.ReadOnly = true;
exp = 1;
}
private void radioRect_CheckedChanged(object sender, EventArgs e)
{
txtH.ReadOnly = true;
txtB.ReadOnly = true;
txtR.ReadOnly = true;
exp = 2;
}
private void radioTriangle_CheckedChanged(object sender, EventArgs e)
{
txtR.ReadOnly = true;
txtL.ReadOnly = true;
txtW.ReadOnly = true;
exp = 3;
}
}
}