Ho Do I Use Multiple Connection String In C# For Sql Server

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Hi,
I want to insert data from one server to another. I am using two connection strings for that. But in insert command how should i define that connection string, I mean how can I define which database belongs to which server

Posted 16-Apr-15 22:52pm

sourch7373

Updated 25-Apr-21 5:51am

John C Rayan

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Andy Lanng 17-Apr-15 5:17am

If the databases are on different servers then you cannot.
Well, you can but you need to do a lot of setup on one of the servers so it can see the other and run commands on it. In 99.9% of cases it just isn't worth it.

there are other ways to get the same effect, though
Can you read from one connection and then write to another, or is the data too big?

John C Rayan 17-Apr-15 5:40am

What's the issue are you facing in having two different connections and using one with SELECT and another one with INSERT. Can you elaborate?

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Suvendu Shekhar Giri · Answer 1 · 2015-04-17T00:51:00

Haven't test it but it should work-
Define two connectionstrings in web.config

<connectionstrings>
  <add name="ConStringDQL">
       providerName="System.Data.SqlClient"
       connectionString= "server=[server1];database=[db name];uid=[user name];pwd=[password]" ></add>
  <add name="ConStringDML">
       providerName="System.Data.SqlClient"
       connectionString= "server=[server2];database=[db name];uid=[user name];pwd=[password]" ></add>
</connectionstrings>

Then create two separate instance of connections using following connection strings

C#

var conStringDQL= ConfigurationManager.ConnectionStrings["conStringDQL"].ConnectionString;
 var conStringDML= ConfigurationManager.ConnectionStrings["conStringDML"].ConnectionString;

Now, use conStringDQL to retrive data and conStringDML to insert/update data.

Hope, it helps :)