calling text file

Accepted answer

You can locate like below,

string connStr = System.IO.File.ReadAllText(@"c:\filename.txt");

An exception of type 'System.InvalidOperationException' occurred in System.Data.dll but was not handled in user code

Additional information: The ConnectionString property has not been initialized.

can you please help me to locate drive

string connStr = System.IO.File.ReadAllText("filename.txt");

filename.txt is the name of your file.
Then, connStr contains the contents of the file.