# ConnectionString Property

## Overloads

| [ConnectionString](https://help.qlik.com/en-US/sense-developer/May2026/Subsystems/NetSDKAPIref/Content/Qlik.Engine.IConnection.ConnectionString.htm#Qlik_Engine_IConnection_ConnectionString) |  | One of:<br><br>\* ODBC CONNECT TO [&lt;provider name&gt;]<br><br>\* OLEDB CONNECT TO [&lt;provider name&gt;]<br><br>\* CUSTOM CONNECT TO [&lt;provider name&gt;]<br><br>\* "&lt;local absolute or relative path, UNC path&gt;"<br><br>\* "&lt;URL&gt;"<br><br>Connection string.<br><br>This parameter is mandatory and must be set when creating or modifying a connection.<br><br>JSON property name: qConnectionString |
| --- | --- | --- |

[](https://help.qlik.com/en-US/sense-developer/Subsystems/NetSDKAPIref/Content/Qlik.Engine.IConnection.ConnectionString.htm) [](https://help.qlik.com/en-US/sense-developer/Subsystems/NetSDKAPIref/Content/Qlik.Engine.IConnection.ConnectionString.htm)

## ConnectionString

One of:

* ODBC CONNECT TO [&lt;provider name&gt;]
* OLEDB CONNECT TO [&lt;provider name&gt;]
* CUSTOM CONNECT TO [&lt;provider name&gt;]
* "&lt;local absolute or relative path, UNC path&gt;"
* "&lt;URL&gt;"

Connection string.

This parameter is mandatory and must be set when creating or modifying a connection.

JSON property name: qConnectionString

### Declaration

```

          string ConnectionString { get; set; }
    
  
```

### Property Value

| Type | Description |
| --- | --- |
| System.String |  |