add custom headers

ConnectionDialog.xaml

@@ -71,6 +71,9 @@
 					<StackPanel>
 						<CheckBox Margin="6,4,0,0" IsChecked="{Binding LogMethod}" TabIndex="11">Method</CheckBox>
 						<CheckBox Margin="6,4,0,0" IsChecked="{Binding LogHeaders}" TabIndex="12">Headers</CheckBox>
+						<Label TabIndex="10">
+							<Hyperlink Click="Hyperlink_Click">Custom Headers...</Hyperlink>
+						</Label>
 					</StackPanel>
 				</GroupBox>
 			</StackPanel>

ConnectionDialog.xaml.cs

@@ -1,3 +1,6 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
 using System.Windows;
 
 namespace OData4.LINQPadDriver
@@ -24,5 +27,24 @@ private void PasswordBox_OnPasswordChanged(object sender, RoutedEventArgs e)
 		{
 			_connectionProperties.Password = PasswordBox.Password;
 		}
+
+		private void Hyperlink_Click(object sender, RoutedEventArgs e)
+		{
+			try
+			{
+				CustomHeadersDialog customHeadersDialog = new CustomHeadersDialog();
+				customHeadersDialog.ShowDialog();
+				var customeHeaders = new List<KeyValuePair<string, string>>();
+				foreach (var item in customHeadersDialog.CustomHeaders.Where(s => !string.IsNullOrEmpty(s.Name)))
+				{
+					customeHeaders.Add(new KeyValuePair<string, string>(item.Name, item.Value));
+				}
+				_connectionProperties.CustomHeaders = customeHeaders;
+			}
+			catch (Exception ex)
+			{
+				MessageBox.Show($"Something went wrong \n{ex.Message}. Please try again!");
+			}
+		}
 	}
 }

CustomHeadersDialog.xaml

@@ -0,0 +1,27 @@
+<Window x:Class="OData4.LINQPadDriver.CustomHeadersDialog"
+        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+        xmlns:local="clr-namespace:OData4.LINQPadDriver"
+        mc:Ignorable="d"
+		Background="{x:Static SystemColors.ControlBrush}"
+        Width="450"
+        WindowStartupLocation="CenterScreen"
+        SizeToContent="Height"
+        ResizeMode="NoResize"
+        Title="CustomHeaders" >
+	<StackPanel Orientation="Vertical" Margin="4" >
+		<DataGrid AutoGenerateColumns="False" MinHeight="200" ItemsSource="{Binding CustomHeaders}">
+			<DataGrid.Columns>
+				<DataGridTextColumn Width="*" Header="Name" Binding="{Binding Name}"/>
+				<DataGridTextColumn Width="*" Header="Value" Binding="{Binding Value}"/>
+			</DataGrid.Columns>
+		</DataGrid>
+		<DockPanel >
+			<Button  Padding="4" Content="Cancel"  Margin="4 0 0 0" Width="60" DockPanel.Dock="Right" Click="Cancel_Click" />
+			<Button Padding="4"  Width="60" Margin="0,0,4,0" Click="OK_Click" Content="OK" DockPanel.Dock="Right"/>
+			<Grid/>
+		</DockPanel>
+	</StackPanel>
+</Window>

CustomHeadersDialog.xaml.cs

@@ -0,0 +1,36 @@
+using System.Collections.Generic;
+using System.Windows;
+
+namespace OData4.LINQPadDriver
+{
+	/// <summary>
+	/// Interaction logic for CustomHeadersDialog.xaml
+	/// </summary>
+	public partial class CustomHeadersDialog : Window
+	{
+		public List<CustomHeader> CustomHeaders { get; set; } = new List<CustomHeader>();
+		public CustomHeadersDialog()
+		{
+			InitializeComponent();
+			DataContext = this;
+		}
+
+		private void OK_Click(object sender, RoutedEventArgs e)
+		{
+			this.Close();
+		}
+
+		private void Cancel_Click(object sender, RoutedEventArgs e)
+		{
+			CustomHeaders.Clear();
+			this.Close();
+		}
+	}
+
+	public class CustomHeader
+	{
+		public string Name { get; set; }
+
+		public string Value { get; set; }
+	}
+}