c# - how to resolve this error "Error:26 - Error locating server/instance specified"?

Question

i want to learn this data access in c# by not using entity framework and it got me stock with this error..

and here is my config

    <configuration>
  <connectionStrings>
    <add name="myPOSDB" 
   connectionString="Server=.sql14;Database=myPOS;Trusted_Connection=True;" 
    providerName="System.Data.SqlClient"/>
  </connectionStrings>
    <startup> 
        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.6.1" 
   />
    </startup>
    </configuration>

and here is my mssms

i wonder whats wrong...pls help me

question from:https://stackoverflow.com/questions/65865403/how-to-resolve-this-error-error26-error-locating-server-instance-specified

Answer 1

Waitting for answers