Remove Extra "Space" using List View and GridView - wpf

Question

So I am using a Grid View inside of a List View and when I run my application I get this weird spacing stuff before the row of my items, between the items, and at the end (can't see in picture), which I want to remove. Here is my XAML.
<ListView x:Name="schemaTableListView"
Width="600"
Height="50"
Margin="0,550,0,0"
ItemsSource="{Binding phase}">
<ListView.View>
<GridView >
<GridView.ColumnHeaderContainerStyle>
<Style TargetType="{x:Type GridViewColumnHeader}">
<Setter Property="IsEnabled" Value="False" />
</Style>
</GridView.ColumnHeaderContainerStyle>
<GridViewColumn Width="300" Header="Source Schema">
<GridViewColumn.CellTemplate>
<DataTemplate>
<TextBox Width="300" />
</DataTemplate>
</GridViewColumn.CellTemplate>
</GridViewColumn>
<GridViewColumn Width="300" Header="Source Table">
<GridViewColumn.CellTemplate>
<DataTemplate>
<TextBox Width="300" />
</DataTemplate>
</GridViewColumn.CellTemplate>
</GridViewColumn>
</GridView>
</ListView.View>
</ListView>
Does anyone know how to remove this? I tried setting the padding to 0 and several other things, but couldn't get it to go away. I bet it is something simple.

Answer 1

The easiest way is to set negativ margin
<ListView>
<ListView.View>
<GridView >
<GridView.ColumnHeaderContainerStyle>
<Style TargetType="{x:Type GridViewColumnHeader}">
<Setter Property="IsEnabled" Value="False" />
</Style>
</GridView.ColumnHeaderContainerStyle>
<GridViewColumn Width="300" Header="Source Schema">
<GridViewColumn.CellTemplate>
<DataTemplate>
<TextBox Width="300" Margin="-6,0" />
</DataTemplate>
</GridViewColumn.CellTemplate>
</GridViewColumn>
<GridViewColumn Width="300" Header="Source Table">
<GridViewColumn.CellTemplate>
<DataTemplate>
<TextBox Width="300" Margin="-6,0" />
</DataTemplate>
</GridViewColumn.CellTemplate>
</GridViewColumn>
</GridView>
</ListView.View>
</ListView>