You can use the SELECT INTO statement to export formatted data to a file.

Data Export with an SQL Query

The following query exports data into a file formatted in comma-separated values (CSV):

C#

String connectionString = "AuthScheme=Basic;Organization=MyAzureDevOpsOrganization;ProjectId=MyProjectId;PersonalAccessToken=MyPAT;";

using (AzureDevOpsConnection connection = new AzureDevOpsConnection(connectionString)) {
  AzureDevOpsCommand cmd = new AzureDevOpsCommand("SELECT Id, BuildNumber INTO [csv://Builds.txt] FROM [Builds] WHERE Reason = 'Manual' ", connection);
  int rowsAffected = cmd.ExecuteNonQuery();
} 

VB.NET

Dim connectionString As [String] = "AuthScheme=Basic;Organization=MyAzureDevOpsOrganization;ProjectId=MyProjectId;PersonalAccessToken=MyPAT;" 

Using connection As New AzureDevOpsConnection(connectionString)
  Dim cmd As New AzureDevOpsCommand("SELECT Id, BuildNumber INTO [csv://Builds.txt] FROM [Builds] WHERE Reason = 'Manual'", connection)
  Dim rowsAffected As Integer = cmd.ExecuteNonQuery()
End Using

You can specify other file formats in the URI. The following example exports tab-separated values:

C#

String connectionString = "AuthScheme=Basic;Organization=MyAzureDevOpsOrganization;ProjectId=MyProjectId;PersonalAccessToken=MyPAT;";

using (AzureDevOpsConnection connection = new AzureDevOpsConnection(connectionString)) {
  AzureDevOpsCommand cmd = new AzureDevOpsCommand("SELECT * INTO [Builds] IN [csv://filename=c:/Builds.csv;delimiter=tab] FROM [Builds] WHERE Reason = 'Manual'", connection);
  int rowsAffected = cmd.ExecuteNonQuery();
} 

VB.NET

Dim connectionString As [String] = "AuthScheme=Basic;Organization=MyAzureDevOpsOrganization;ProjectId=MyProjectId;PersonalAccessToken=MyPAT;" 

Using connection As New AzureDevOpsConnection(connectionString)
  Dim cmd As New AzureDevOpsCommand("SELECT * INTO [Builds] IN [csv://filename=c:/Builds.csv;delimiter=tab] FROM [Builds] WHERE Reason = 'Manual'", connection)
  Dim rowsAffected As Integer = cmd.ExecuteNonQuery()
End Using