# DataGrid: Filter API

Set the initial filter of your RadzenDataGrid via the FilterValue and FilterOperator column properties.

Keywords: filter, api, grid, datagrid, table

> API reference: [RadzenDataGrid API](https://blazor.radzen.com/docs/api/Radzen.Blazor.RadzenDataGrid-1.md)

## Examples

## Blazor DataGrid Filter API


```razor
@inherits DbContextPage

<RadzenDataGrid @ref="grid" AllowFiltering="true" AllowColumnResize="true" 
    FilterMode="FilterMode.Simple" PageSize="5" AllowPaging="true" AllowSorting="true" Data="@employees" ColumnWidth="300px" 
    FilterCaseSensitivity="FilterCaseSensitivity.CaseInsensitive"  TItem="Employee"
    LogicalFilterOperator="LogicalFilterOperator.Or" Filter="@OnFilter">
    <Columns>
        <RadzenDataGridColumn Property="@nameof(Employee.EmployeeID)" Title="ID" Frozen="true" Width="80px" TextAlign="TextAlign.Center" />
        <RadzenDataGridColumn Title="Photo" Sortable="false" Filterable="false" Width="200px" >
            <Template Context="data">
                <RadzenImage Path="@data.Photo" style="width: 40px; height: 40px; border-radius: 8px;" AlternateText="@(data.FirstName + " " + data.LastName)" />
            </Template>
        </RadzenDataGridColumn>
        <RadzenDataGridColumn Property="@nameof(Employee.FirstName)" Title="First Name" />
        <RadzenDataGridColumn Property="@nameof(Employee.LastName)" Title="Last Name" Width="150px"/>
        <MyCustomDataGridColumn Property="@nameof(Employee.BirthDate)" Title="Birth Date" FormatString="{0:d}" />
        <RadzenDataGridColumn Property="@nameof(Employee.Country)" Title="Country" />
        <RadzenDataGridColumn Property="@nameof(Employee.Notes)" Title="Notes" />
    </Columns>
</RadzenDataGrid>

@code {
    IEnumerable<Employee> employees;
    RadzenDataGrid<Employee> grid;

    protected override async Task OnInitializedAsync()
    {
        await base.OnInitializedAsync();

        employees = dbContext.Employees;
    }

    protected override Task OnAfterRenderAsync(bool firstRender)
    {
        if(firstRender)
        {
            var column = grid.ColumnsCollection.Where(c => c.Property == "FirstName").FirstOrDefault();

            if(column != null)
            {
                column.SetFilterValue("Nan");
                column.SetFilterOperator(FilterOperator.StartsWith);
                grid.Reload();
            }
        }

        return base.OnAfterRenderAsync(firstRender);
    }

    void OnFilter(DataGridColumnFilterEventArgs<Employee> args)
    {
    //
    }
}
```