Translate string using Google API in Windows Application using C# and VB.Net

Hi ashishk,

Please refer below sample.

You will need to register and generate and get Google API key and also enable the Google Translation (Translate) API in the Google Console.

 For more details refer here.

Namespaces

C#

using System.Net;
using System.Web.Script.Serialization;

VB.Net

Imports System.Net
Imports System.Web.Script.Serialization

Code

C#

private void Form1_Load(object sender, EventArgs e)
{
    DataTable dt = new DataTable();
    dt.Columns.AddRange(new DataColumn[] { new DataColumn("LanguageName", typeof(string)), new DataColumn("ISOCode", typeof(string)) });
    dt.Rows.Add("Hindi", "HI");
    dt.Rows.Add("English", "EN");
    ddlSource.DataSource = dt;
    ddlSource.ValueMember = "ISOCode";
    ddlSource.DisplayMember = "LanguageName";

    DataTable dt1 = new DataTable();
    dt1.Columns.AddRange(new DataColumn[] { new DataColumn("LanguageName", typeof(string)), new DataColumn("ISOCode", typeof(string)) });
    dt1.Rows.Add("Hindi", "HI");
    dt1.Rows.Add("English", "EN");
    dt1.Rows.Add("Marathi", "MR");
    dt1.Rows.Add("Gujarati", "GU");

    ddlTarget.DataSource = dt1;
    ddlTarget.ValueMember = "ISOCode";
    ddlTarget.DisplayMember = "LanguageName";
}
private void button1_Click(object sender, EventArgs e)
{
    string url = "https://translation.googleapis.com/language/translate/v2?key=API Key";
    url += "&source=" + ddlSource.SelectedValue;
    url += "&target=" + ddlTarget.SelectedValue;
    url += "&q=" + Uri.EscapeUriString(txtSource.Text);
    WebClient client = new WebClient();
    client.Encoding = System.Text.Encoding.UTF8;
    string json = client.DownloadString(url);
    JsonData jsonData = (new JavaScriptSerializer()).Deserialize<JsonData>(json);
    txtTarget.Text = jsonData.Data.Translations[0].TranslatedText;
}
public class JsonData
{
    public Data Data { get; set; }
}
public class Data
{
    public List<Translation> Translations { get; set; }
}
public class Translation
{
    public string TranslatedText { get; set; }
}

VB.Net

Private Sub Form1_Load(ByVal sender As Object, ByVal e As EventArgs)
    Dim dt As DataTable = New DataTable()
    dt.Columns.AddRange(New DataColumn() {New DataColumn("LanguageName", GetType(String)), New DataColumn("ISOCode", GetType(String))})
    dt.Rows.Add("Hindi", "HI")
    dt.Rows.Add("English", "EN")
    ddlSource.DataSource = dt
    ddlSource.ValueMember = "ISOCode"
    ddlSource.DisplayMember = "LanguageName"
    Dim dt1 As DataTable = New DataTable()
    dt1.Columns.AddRange(New DataColumn() {New DataColumn("LanguageName", GetType(String)), New DataColumn("ISOCode", GetType(String))})
    dt1.Rows.Add("Hindi", "HI")
    dt1.Rows.Add("English", "EN")
    dt1.Rows.Add("Marathi", "MR")
    dt1.Rows.Add("Gujarati", "GU")
    ddlTarget.DataSource = dt1
    ddlTarget.ValueMember = "ISOCode"
    ddlTarget.DisplayMember = "LanguageName"
End Sub

Private Sub button1_Click(ByVal sender As Object, ByVal e As EventArgs)
    Dim url As String = "https://translation.googleapis.com/language/translate/v2?key=API Key"
    url += "&source=" & ddlSource.SelectedValue
    url += "&target=" & ddlTarget.SelectedValue
    url += "&q=" & Uri.EscapeUriString(txtSource.Text)
    Dim client As WebClient = New WebClient()
    client.Encoding = System.Text.Encoding.UTF8
    Dim json As String = client.DownloadString(url)
    Dim jsonData As JsonData = (New JavaScriptSerializer()).Deserialize(Of JsonData)(json)
    txtTarget.Text = jsonData.Data.Translations(0).TranslatedText
End Sub

Public Class JsonData
    Public Property Data As Data
End Class

Public Class Data
    Public Property Translations As List(Of Translation)
End Class

Public Class Translation
    Public Property TranslatedText As String
End Class

Screenshot