# GrainCallFrequency Properties

[Type overview](/orleans/docs/api/csharp/microsoft.orleans.core/orleans.runtime.graincallfrequency/)

## CallCount {#callcount-4eb79aad}

[Dedicated page](/orleans/docs/api/csharp/microsoft.orleans.core/orleans.runtime.graincallfrequency/properties/callcount-4eb79aad/)

[Source](https://github.com/dotnet/orleans/blob/e4e752cedecc2976811db49802c7a999b1f1c704/src/Orleans.Core/SystemTargetInterfaces/IManagementGrain.cs)

```csharp
[Orleans.Id(4)]
public ulong CallCount
```

The estimated number of calls made.

## SourceGrain {#sourcegrain-fe3cf777}

[Dedicated page](/orleans/docs/api/csharp/microsoft.orleans.core/orleans.runtime.graincallfrequency/properties/sourcegrain-fe3cf777/)

[Source](https://github.com/dotnet/orleans/blob/e4e752cedecc2976811db49802c7a999b1f1c704/src/Orleans.Core/SystemTargetInterfaces/IManagementGrain.cs)

```csharp
[Orleans.Id(0)]
public GrainId SourceGrain
```

The source grain.

## SourceHost {#sourcehost-24b33aab}

[Dedicated page](/orleans/docs/api/csharp/microsoft.orleans.core/orleans.runtime.graincallfrequency/properties/sourcehost-24b33aab/)

[Source](https://github.com/dotnet/orleans/blob/e4e752cedecc2976811db49802c7a999b1f1c704/src/Orleans.Core/SystemTargetInterfaces/IManagementGrain.cs)

```csharp
[Orleans.Id(2)]
public SiloAddress SourceHost
```

The source host.

## TargetGrain {#targetgrain-e16c119f}

[Dedicated page](/orleans/docs/api/csharp/microsoft.orleans.core/orleans.runtime.graincallfrequency/properties/targetgrain-e16c119f/)

[Source](https://github.com/dotnet/orleans/blob/e4e752cedecc2976811db49802c7a999b1f1c704/src/Orleans.Core/SystemTargetInterfaces/IManagementGrain.cs)

```csharp
[Orleans.Id(1)]
public GrainId TargetGrain
```

The target grain.

## TargetHost {#targethost-4373e067}

[Dedicated page](/orleans/docs/api/csharp/microsoft.orleans.core/orleans.runtime.graincallfrequency/properties/targethost-4373e067/)

[Source](https://github.com/dotnet/orleans/blob/e4e752cedecc2976811db49802c7a999b1f1c704/src/Orleans.Core/SystemTargetInterfaces/IManagementGrain.cs)

```csharp
[Orleans.Id(3)]
public SiloAddress TargetHost
```

The target host.