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Showing content from https://docs.microsoft.com/en-us/dotnet/api/system.data.sqlclient.sqlconnection.datasource below:

SqlConnection.DataSource Property (System.Data.SqlClient) | Microsoft Learn

SqlConnection.DataSource Property Definition

Gets the name of the instance of SQL Server to which to connect.

public:
 virtual property System::String ^ DataSource { System::String ^ get(); };

public:
 property System::String ^ DataSource { System::String ^ get(); };

public override string DataSource { get; }

[System.Data.DataSysDescription("SqlConnection_DataSource")]
public string DataSource { get; }

[System.ComponentModel.Browsable(true)]
public override string DataSource { get; }

member this.DataSource : string

[<System.Data.DataSysDescription("SqlConnection_DataSource")>]
member this.DataSource : string

[<System.ComponentModel.Browsable(true)>]
member this.DataSource : string

Public Overrides ReadOnly Property DataSource As String

Public ReadOnly Property DataSource As String

Property Value

The name of the instance of SQL Server to which to connect. The default value is an empty string.

Attributes

Examples

The following example creates a SqlConnection and displays some of its read-only properties.

private static void OpenSqlConnection(string connectionString)
{
    using (SqlConnection connection = new SqlConnection(connectionString))
    {
        connection.Open();
        Console.WriteLine("ServerVersion: {0}", connection.ServerVersion);
        Console.WriteLine("DataSource: {0}", connection.DataSource);
    }
}

Private Sub OpenSqlConnection(ByVal connectionString As String)
    Using connection As New SqlConnection(connectionString)
        connection.Open()
        Console.WriteLine("ServerVersion: {0}", connection.ServerVersion)
        Console.WriteLine("DataSource: {0}", connection.DataSource)
    End Using
End Sub

Remarks

Note

The DataSource property returns null if the connection string for the SqlConnection is "context connection=true".