new line in C# code

Hello,
I wrote a message and it is too long. I want to make it to line one below the other. This is my code. I am working on C#.
this
.lblMessage.Text="This Broker Name already exist."+"\r"+"Please use another Broker Name or search for Existing Broker."; It does not work. I would like the text appear this way.
This Broker Name already exist.
Please use another Broker Name or search for Existing Broker.
Can someone help me
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