Compiler Error Message: CS1009: Unrecognized escape sequence? [closed] - mysql

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At run-time server error showing in webbrowser regarding Unrecognized escape sequence .
Error Description:
Server Error in '/image11' Application. Compilation Error Description:
An error occurred during the compilation of a resource required to
service this request. Please review the following specific error
details and modify your source code appropriately.
Compiler Error Message: CS1009: Unrecognized escape sequence
Source Error:
Line 21: public void getcon()
Line 22: {
Line 23: con.ConnectionString = "Data Source=.\SQLEXPRESS;AttachDbFilename=C:\Users\MUNDADAN\Documents\..mdf;Integrated Security=True;Connect Timeout=30;User Instance=True";
Line 24: con.Open();
Line 25: }
Source File: d:\MY .Net(RuleZZ)\image11\App_Code\Class1.cs Line: 23
Show Detailed Compiler Output:
Show Complete Compilation Source:

Answer 1

con.ConnectionString = "Data Source=.\SQLEXPRESS;AttachDbFilename=C:\Users\MUNDADAN\Documents\..mdf;Integrated Security=True;Connect Timeout=30;User Instance=True";
This is wrong
Try this
con.ConnectionString = #"Data Source=.\SQLEXPRESS;AttachDbFilename=C:\Users\MUNDADAN\Documents\..mdf;Integrated Security=True;Connect Timeout=30;User Instance=True";
or
con.ConnectionString = "Data Source=.\\SQLEXPRESS;AttachDbFilename=C:\\Users\\MUNDADAN\\Documents\\..mdf;Integrated Security=True;Connect Timeout=30;User Instance=True";