Define connection string in windows form application using Sql Server in visual studio 10 using .sdf file

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hello everyone!!

actually i am creating windows form base application, here i am using a database .sdf file, i have used app.config file for connection string, the connection is working through the dataset.xsd file, but when i using connection programmatically, its showing error while opening connection.

Error : A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: SQL Network Interfaces, error: 26 - Error Locating Server/Instance Specified)

app.config :

XML

<?xml version="1.0" encoding="utf-8"?>
<configuration>
    <configSections>
    </configSections>
    <connectionStrings>
        <add name="ConString" connectionString="Data Source=|DataDirectory|\Northwind.sdf" providerName="Microsoft.SqlServerCe.Client.3.5" />
    </connectionStrings>
</configuration>

c# Code

C#

string conStr = ConfigurationManager.ConnectionStrings["ConString"].ConnectionString;
            SqlConnection con = new SqlConnection(conStr);
            SqlCommand cmd = new SqlCommand();
            SqlDataReader dr;

            try
            {
                //open connection
                con.Open();
                //prepare connection object to get the data through
                //reader and populate into dataset
                cmd.CommandType = CommandType.Text;
                cmd.Connection = con;
                cmd.CommandText = "Select ProductName From Products";

Friends please suggest Something....

Posted 26-Feb-15 1:34am

Altaf Ansari89

Updated 26-Feb-15 1:52am

v2

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2 solutions

Solution 1

Try this link should help you
.NET Compact Framework Data Provider for SQL Server Compact[^]

Posted 26-Feb-15 1:43am

manak chand

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udoyen · Accepted Answer · 2015-03-10T18:00:00

Hi Altaf, I had the same problem this helped me try this.
change your code to the following, you should be using "SqlCeConnection class", rather than "SqlConnection class"...

C#

string conStr = ConfigurationManager.ConnectionStrings["ConString"].ConnectionString;
            SqlCeConnection con = new SqlCeConnection(conStr);
            SqlCeCommand cmd = new SqlCeCommand();
            SqlCeDataReader dr;
 
            try
            {
                //open connection
                con.Open();
                //prepare connection object to get the data through
                //reader and populate into dataset
                cmd.CommandType = CommandType.Text;
                cmd.Connection = con;
                cmd.CommandText = "Select ProductName From Products";