c# - Error while login phase in asp.net -


i have configured web application iis host , working fine when trying have login aspx page , sql connection , trying login , error:

a network-related or instance-specific error occurred while establishing connection sql server. server not found or not accessible. verify instance name correct , sql server configured allow remote connections. (provider: sql network interfaces, error: 50 - local database runtime error occurred. cannot create automatic instance. see windows application event log error details.

data source=(localdb)\v11.0;attachdbfilename="where database";integrated security=true

source error: line 20: protected void login1_authenticate1(object sender, authenticateeventargs e) line 21: { line 22: if (membership.validateuser(login1.username, login1.password) == true) line 23: { line 24: login1.visible = true;

here stack trace:

enter image description here )


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