arvindasp says:
SendEmailHrams; Object reference not set to an instance of an object.
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<startup>
<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.7.2" />
</startup>
<configuration>
<connectionStrings>
<add name="HramsConWeb" connectionString="Data Source=SqlServerName;User ID=sa;Password=................;Connect Timeout=30;Encrypt=True;Trust Server Certificate=True;Application Intent=ReadWrite;Multi Subnet Failover=False" providerName="System.Data.SqlClient" />
</connectionStrings>
</configuration>
</configuration>
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You have not placed the connectionString correctly.
Why you have two configuration tags in App.Config file?