How to set textbox to readonly when checkbox checked?

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how to set textbox to readonly when checkbox checked?<pre> <pre lang="c#">

multiple checkbox control & multiple textbox control I have a textbox which is by default is read only. when the checkbox is checked, the textbox will readonly=false and let user input. anyway to do it? in c#.this will be done.in this way but i wan't create all event in one function.
CheckStateChanged event

private void stn1Bcd1Prnt_CheckStateChanged(object sender, EventArgs e)
        //{
        //    txSt1Bcd1Name.Enabled = (stn1Bcd1Prnt.CheckState == CheckState.Checked);
        //    txSt1Bcd1From.Enabled = (stn1Bcd1Prnt.CheckState == CheckState.Checked);
        //    txSt1Bcd1To.Enabled = (stn1Bcd1Prnt.CheckState == CheckState.Checked);
        //    txSt1Bcd1Name.Clear();
        //    txSt1Bcd1From.Clear();
        //    txSt1Bcd1To.Clear();
        //}

checkbox checked event

//txSt1Bcd1Name.ReadOnly = false;
           //txSt1Bcd1From.ReadOnly = false;
           //txSt1Bcd1To.ReadOnly = false;
           //txSt1Bcd1Name.Clear();
           //txSt1Bcd1From.Clear();
           //txSt1Bcd1To.Clear();

What I have tried:

private void chkboxinfo(object sender, EventArgs e)
       {

           try
           {
         int noOfInputOutputParameter = 80;
              for (int i = 0; i <= noOfInputOutputParameter; i++)
                 {
                    var textBox = sender as TextBox;
                     string IOName = "txtX";
                      CheckBox chkBox = (CheckBox)sender;
                    if (chkBox.Checked.ToString() == "1")// If checkBox is checked True
                   {
                       Controls.Find(IOName, true).IsReadOnly.ToString();

                       //textBox.ReadOnly = false;
                    }
                   else if (chkBox.CheckState.ToString() == "0")
                   {
                  //txSt7Bcd1Name.Enabled = (stn7Bcd1Prnt.CheckState == CheckState.Checked);

                       //textBox.Enabled = (chkBox.CheckState == CheckState.Checked);
                       Controls.Find(IOName, false).FirstOrDefault().Enabled.ToString();
                       textBox.Clear();
                       //textBox.ReadOnly = false;

                   }
               }
           }
            catch (Exception ex)
           {
               MessageBox.Show(ex.Message, "chkboxinfo,frmSetting", MessageBoxButtons.OK, MessageBoxIcon.Error);

           }
       }

Posted 30-Nov-20 19:13pm

Member 15008265

Updated 30-Nov-20 20:45pm

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Comments

Maciej Los 1-Dec-20 2:01am

What's wrong with your code?

Member 15008265 1-Dec-20 4:37am

actually i try.. I have a textbox which is by default is read only. when the checkbox is checked, the textbox will readonly=false and let user input.

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OriginalGriff · Accepted Answer · 2020-11-30T20:45:00

Your code is ... um ... odd.
Ignoring the commented out stuff - which will make it not compile so I assume you did it for presentation to us - you have lines that do nothing other than perhaps throw an exception:

C#

Controls.Find(IOName, true).IsReadOnly.ToString();

If it finds the control, it will convert it to "true" or "false" and then discard the string. If it doesn't, it'll throw a null reference exception.
This code:

C#

var textBox = sender as TextBox;

will always result in null since a CheckBox isn't derived from TextBox.
This line will always be false:

C#

if (chkBox.Checked.ToString() == "1")

As will this one:

C#

else if (chkBox.CheckState.ToString() == "0")

Since bool.ToStringwill always return a string "true" or "false" and never "0" or "1"
YOu have no code to cope with a if ... else if that doesn't match either: you need to use if ... else if ... else to check.
Your loop does nothing of any use since you don't use i inside it, and nothing else changes from iteration to iteration.
Try this:

C#

private void chkboxinfo(object sender, EventArgs e)
   {
   if (sender is CheckBox cb)
      {
      textBox.ReadOnly = cb.Checked == CheckState.Checked;
      }
   }