Cannot edit cells of my DataGrid WPF Framework 4.5

Question

My ObservableCollection has three items, and the rows are consistently shown in the datagrid. I cannot turn into edit mode a single cell of my DataGrid. I tried click, click

Answer 1

You have placed TextBlock in cell template as well as in cell editing template. That's why you are not noticing any change on pressing F2 and double-clicking the cell since no matter what it will always be TextBlock which you can't edit.

Either placed TextBox in your CellEditingTemplate like this -

<DataGridTemplateColumn Header="Formulation" Width="100" IsReadOnly="False">
    <DataGridTemplateColumn.CellTemplate>
        <DataTemplate>
            <TextBlock Text="{Binding FormulationStr}" />
        </DataTemplate>
    </DataGridTemplateColumn.CellTemplate>
    <DataGridTemplateColumn.CellEditingTemplate>
        <DataTemplate>
            <TextBox Text="{Binding FormulationStr}" />
        </DataTemplate>
    </DataGridTemplateColumn.CellEditingTemplate>
</DataGridTemplateColumn>

Or either simply use the DataGridTextColumn in place of DataGridTemplateColumn which internally provides the support what are you trying to achive by the above code -

<DataGridTextColumn Header="Formulation" Width="100" IsReadOnly="False" Binding="{Binding FormulationStr}" />