How Do I Automatically Get Pc Name In Connection String

try this..  
 

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System.Net.Dns.GetHostName();

or

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System.Environment.GetEnvironmentVariable("COMPUTERNAME");

 
gives you current pc name..  
 

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 SqlConnectionStringBuilder connectionString = new SqlConnectionStringBuilder();
     connectionString.DataSource = System.Net.Dns.GetHostName();
     connectionString.InitialCatalog = "MyDatabase";
     connectionString.IntegratedSecurity = true;