dotnet / dotnet/wpf

richTextBox.Lines[0] = richTextBox.Lines[0]. Remove(0, 11)) this command does not work.

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Description

_This issue has been moved from [a ticket on Developer Community](https://developercommunity.visualstudio.com/t/richTextBoxLines0--richTextBoxLines/10939603)._

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[severity:It's more difficult to complete my work]
richTextBox.Lines[0] = richTextBox.Lines[0]. Remove(0, 11)) this command does not work. It has no function. richTextBox.Lines[0] does not do its job. You have programmed it incompletely or programmed it incorrectly.

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### Original Comments

#### Feedback Bot on 21/7/2025, 09:05 AM:

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