Auto-Complete.ps1

Function Auto-Complete()
{
Return (Invoke-RestMethod -Uri "http://api.bing.com/qsml.aspx?query=$($TextBox1.text)").searchsuggestion.section.item.text

}

Function Create-WinForm()
{
        #Calling the Assemblies
        [void] [System.Reflection.Assembly]::LoadWithPartialName("System.Windows.Forms")
        [void] [System.Reflection.Assembly]::LoadWithPartialName("System.Drawing")
        
        #Create the Conatainer Form  to place the Labels and Textboxes
        $Form = New-Object “System.Windows.Forms.Form”;
        $Form.Width = 340;
        $Form.Height = 310;
        $Form.Text = 'Enter your Search Query'
        $Form.StartPosition = [System.Windows.Forms.FormStartPosition]::CenterScreen;
        $Form.TopMost = $true
        $Form.KeyPreview = $true
        $Form.FormBorderStyle = 'Fixed3d'
        
        # Define the font to be used in the Form
        $Font = New-Object System.Drawing.Font("lucida sans",12,[System.Drawing.FontStyle]::bold) 

        #Define Label1
        $Label1 = New-Object “System.Windows.Forms.Label”;
        $Label1.Left = 10;
        $Label1.Top = 15;
        $Label1.Height = 25
        $Label1.Width = 120
        $Label1.Text = 'Search Query';
        $Label1.Font =$Font
    
        #Define Label2
        $Label2 = New-Object “System.Windows.Forms.Label”;
        $Label2.Left = 10;
        $Label2.Top = 50;
        $Label2.Height = 220
        $Label2.Width = 310
        $Label2.Text = '';
        $Label2.BorderStyle = "FixedSingle"
        $Label2.Font= $Font
        #$Label2.AutoScrollOffset
    
        #Define TextBox1 for input
        $TextBox1 = New-Object “System.Windows.Forms.RichTextBox”;
        $TextBox1.Left = 140;
        $TextBox1.Top = 10;
        $TextBox1.Height = 30
        $TextBox1.width = 180;
        $TextBox1.Font = $Font

        #Defining the Form Key Listener
        $form.add_keyup({      
                            $Data = Auto-Complete
                            $Data | %{$StrWithLineBreaks+=$_+';'}
                            $Label2.text=$StrWithLineBreaks -replace ";","`n"
        })
    
        #Adding Controls to the Form
        $Form.Controls.Add($Label1);
        $Form.Controls.Add($TextBox1);
        $Form.Controls.Add($Label2);
        $Form.ShowDialog()|Out-Null
}

Create-WinForm

Thanks Prasoon :)