Changing the icon of ErrorProvider gives exception

Question

I am trying to change the icon of errorProvider in Windowsform. I have added .ico files in Properties->Resources folder. I have tried directly copy pasting the .ico file, have also used the Add resources->Add Existing Files option. What ever I do, if I add my own .ico file and try to set them as errorProvider icon as show in the code below, I get an exception while running the program (particularly when trying to demonstrate the the errorProvider feature in my program). My code is:

 private void textBox1_Leave(object sender, EventArgs e)
        {
            if(string.IsNullOrEmpty(textBox1.Text))
            {
                textBox1.Focus();
                errorProvider1.Icon = Properties.Resources.cross; //here I have change the default icon
                errorProvider1.SetError(this.textBox1, "Input UserId"); //having exception in this line
            }
            else
            {
                errorProvider1.Icon = Properties.Resources.right;
            }
        }

The exception details:

System.StackOverflowException
  HResult=0x800703E9
  Source=<Cannot evaluate the exception source>
  StackTrace:
<Cannot evaluate the exception stack trace>

Answer 1

Adding resources through Resource.resx can also refer to ico very well. Copy if new is another calling method.

Add existing resources：

It might be better to change the leave event to the Validating event.

I have tested your code itself and there is no problem.

I have reproduced the error here because it is caused by the ico file itself.

It can be solved by changing a picture.

The error document is here.

private void TextBox1_Validating(object sender, CancelEventArgs e) {
    if(string.IsNullOrEmpty(textBox1.Text)) {
            textBox1.Focus();
            errorProvider1.Icon=Properties.Resources.error__3_; //here I have change the default icon
            errorProvider1.SetError(textBox1, "Input UserId"); //having exception in this line
        } else {
            errorProvider1.Icon=Properties.Resources.yes1;
    }
}

You can use a file converter to convert to ico.

Output:

Answer 2

first add ur ico file to resource and set the "Copy to Output Directory" to copy always

Copy to Outpot Directory Example

 private void textBox1_Validating(object sender, CancelEventArgs e)
    {
        if (textBox1.Text.Trim() == "") 
        {
            errorProvider1.SetError(textBox1, "ERROR WARNING");
            errorProvider1.Icon = new Icon(@"Resources\termicon.ico");
        }
            
        
    
    }

Example

Answer 3

double click on Resources.resx in your solution explorer then select resource type and click on Add Resource -> Add Existing file