Grid inside Grid in XAML

Question

I want to have a childGrid in second column of parentGrid (in childGrid I want to have two columns: first for label, second for textbox)

How can I do Something like that? I tried the following code:

<Grid>
    <Grid.ColumnDefinitions>
        <ColumnDefinition Height="*"/>
        <ColumnDefinition Height="*"/>
        <RowDefinition Height="*"/>
        <RowDefinition Height="*"/>
    </Grid.ColumnDefinitions>
    <Grid Grid.Column=1>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Height="*"/>
            <ColumnDefinition Height="*"/>
        </Grid.ColumnDefinitions>
        <Grid.RowDefinitions>
            <RowDefinition Height="*"/>
            <RowDefinition Height="*"/>
            <RowDefinition Height="*"/>
            <RowDefinition Height="*"/>
        </Grid.RowDefinitions>
    </Grid>
</Grid>

Answer 1

Based on your code, just fixed up a little:

<Grid>
    <Grid.ColumnDefinitions>
        <ColumnDefinition />
        <ColumnDefinition  />
    </Grid.ColumnDefinitions>
    <Grid Grid.Column="1">
        <Grid.ColumnDefinitions>
            <ColumnDefinition />
            <ColumnDefinition />
        </Grid.ColumnDefinitions>
        <Grid.RowDefinitions>
            <RowDefinition Height="*"/>
            <RowDefinition Height="*"/>
            <RowDefinition Height="*"/>
            <RowDefinition Height="*"/>
        </Grid.RowDefinitions>
    </Grid>
</Grid>

Note that ColumnDefinition don't have a Height - they have a Width. You also need to define the ColumnDefinitions and RowDefinitions separately - you have them mixed together in your outer grid. I removed the RowDefinitions from the outer grid because you don't appear to be using them. Your inner grid has two columns and four rows.