# IConnection Interface
Namespace: [Qlik.Engine](https://help.qlik.com/en-US/sense-developer/May2025/Subsystems/NetSDKAPIref/Content/Qlik.Engine.htm)
Assembly: Qlik.Engine.dll
## Syntax
```
[ValueClass]
public interface IConnection
```
## Properties
| Name | Description |
| --- | --- |
| [ConnectionString](https://help.qlik.com/en-US/sense-developer/May2025/Subsystems/NetSDKAPIref/Content/Qlik.Engine.IConnection.ConnectionString.htm#Qlik_Engine_IConnection_ConnectionString) | One of:
\* ODBC CONNECT TO [<provider name>]
\* OLEDB CONNECT TO [<provider name>]
\* CUSTOM CONNECT TO [<provider name>]
\* "<local absolute or relative path, UNC path>"
\* "<URL>"
Connection string.
This parameter is mandatory and must be set when creating or modifying a connection.
JSON property name: qConnectionString |
| [Id](https://help.qlik.com/en-US/sense-developer/May2025/Subsystems/NetSDKAPIref/Content/Qlik.Engine.IConnection.Id.htm#Qlik_Engine_IConnection_Id) | Identifier of the connection.
Is generated by the engine and is unique.
JSON property name: qId |
| [LogOn](https://help.qlik.com/en-US/sense-developer/May2025/Subsystems/NetSDKAPIref/Content/Qlik.Engine.IConnection.LogOn.htm#Qlik_Engine_IConnection_LogOn) | Select which user credentials to use to connect to the source.
\* LOG\_ON\_SERVICE\_USER: Disables
\* LOG\_ON\_CURRENT\_USER: Enables
JSON property name: qLogOn |
| [Meta](https://help.qlik.com/en-US/sense-developer/May2025/Subsystems/NetSDKAPIref/Content/Qlik.Engine.IConnection.Meta.htm#Qlik_Engine_IConnection_Meta) | Information about the connection.
JSON property name: qMeta |
| [ModifiedDate](https://help.qlik.com/en-US/sense-developer/May2025/Subsystems/NetSDKAPIref/Content/Qlik.Engine.IConnection.ModifiedDate.htm#Qlik_Engine_IConnection_ModifiedDate) | Is generated by the engine.
Creation date of the connection or last modification date of the connection.
JSON property name: qModifiedDate |
| [Name](https://help.qlik.com/en-US/sense-developer/May2025/Subsystems/NetSDKAPIref/Content/Qlik.Engine.IConnection.Name.htm#Qlik_Engine_IConnection_Name) | Name of the connection.
This parameter is mandatory and must be set when creating or modifying a connection.
JSON property name: qName |
| [Password](https://help.qlik.com/en-US/sense-developer/May2025/Subsystems/NetSDKAPIref/Content/Qlik.Engine.IConnection.Password.htm#Qlik_Engine_IConnection_Password) | Password of the user who creates the connection.
This parameter is optional; it is only used for OLEDB, ODBC and CUSTOM connections.
A call to `GetConnection Method` does not return the password.
JSON property name: qPassword |
| [Type](https://help.qlik.com/en-US/sense-developer/May2025/Subsystems/NetSDKAPIref/Content/Qlik.Engine.IConnection.Type.htm#Qlik_Engine_IConnection_Type) | One of:
\* ODBC
\* OLEDB
\* <Name of the custom connection file>
\* folder
\* internet
Type of the connection.
This parameter is mandatory and must be set when creating or modifying a connection.
For ODBC, OLEDB and custom connections, the engine checks that the connection type matches the connection string.
The type is not case sensitive.
JSON property name: qType |
| [UserName](https://help.qlik.com/en-US/sense-developer/May2025/Subsystems/NetSDKAPIref/Content/Qlik.Engine.IConnection.UserName.htm#Qlik_Engine_IConnection_UserName) | Name of the user who creates the connection.
This parameter is optional; it is only used for OLEDB, ODBC and CUSTOM connections.
A call to `GetConnection Method` does not return the user name.
JSON property name: qUserName |