The type initializer for 'system.data.sqlclient.sqlconnection' threw an exception.

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?xml version="1.0"encoding="utf";
<configuration>
<startup>
<supportedruntime version="v4.0" sku=".NETFramework,Version=v4.5">

<configsections>

<connectionstring>
<add name="ConnectionString" providername="System.Data.SqlClient" connectionstring="server=CTSINTBMC;database=One995;Integrated Security=SSPI;Persist Security Info=False;Max pool size = 20;Min pool size = 0">

in console application code as follows

SqlConnection sqlConnection = new SqlConnection("ConnectionString");
SqlCommand cmd = new SqlCommand();
SqlDataReader reader;
cmd.commandtext = "select * from customers";
cmd.CommandType = CommandType.Text;
cmd.Connection = sqlConnection;
sqlConnection.Open();
reader = cmd.ExecuteReader();
sqlConnection.Close();

when i execute the above code shows error as follows

The type initializer for 'System.Data.SqlClient.SqlConnection' threw an exception.

the following error shows in below line as follows

SqlConnection sqlConnection = new SqlConnection("ConnectionString");

please help me what is the problem in my above code

What I have tried:

?xml version="1.0"encoding="utf";
<configuration>
<startup>
<supportedruntime version="v4.0" sku=".NETFramework,Version=v4.5">

<configsections>

<connectionstring>
<add name="ConnectionString" providername="System.Data.SqlClient" connectionstring="server=CTSINTBMC;database=One995;Integrated Security=SSPI;Persist Security Info=False;Max pool size = 20;Min pool size = 0">

in console application code as follows

SqlConnection sqlConnection = new SqlConnection("ConnectionString");
SqlCommand cmd = new SqlCommand();
SqlDataReader reader;
cmd.commandtext = "select * from customers";
cmd.CommandType = CommandType.Text;
cmd.Connection = sqlConnection;
sqlConnection.Open();
reader = cmd.ExecuteReader();
sqlConnection.Close();

when i execute the above code shows error as follows

The type initializer for 'System.Data.SqlClient.SqlConnection' threw an exception.

the following error shows in below line as follows

SqlConnection sqlConnection = new SqlConnection("ConnectionString");

please help me what is the problem in my above code

Posted 12-Aug-16 1:44am

sudhakarthikeyan

Updated 12-Aug-16 2:17am

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Comments

Nathan Minier 12-Aug-16 7:48am

So....are you passing a real connection string to the constructor?

Also, please dispose of things properly!

Have a look at:
http://www.codeproject.com/Articles/837599/Using-Csharp-to-connect-to-and-query-from-a-SQL-da

Rob Philpott 12-Aug-16 8:06am

This is an extremely strange error to receive. The type initializer is the static constructor of the class which suggests something has gone wrong internally within System.Data.

Can you post the full exception, including any inner exceptions to reveal any more info?

ZurdoDev 12-Aug-16 8:18am

There should be more to the error that will tell you exactly what the problem is.

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The Praveen Singh · Answer 1 · 2016-08-12T02:17:00

C#

hey it may be the problem with app.config settings.

u hv to code like this

 

<appSettings>

<add key ="ConnectionString" value="Data Source=server name;Initial Catalog=db name;User ID= sa;Password= sa"/>

</appSettings>

 

if u code this wrongly ,typeintializer error w'll throw.

Also if the key name is used different from app.config also exception will throw.