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In this Article, We will learn how to create AutoCompleteTextBox using C# Windows Form Application. In my previous article, we learned How to Search Records in DataGridView Using C#. Let's Begin. Create a new Windows Form Application. Drop a Label and TextBox Control from the ToolBox. Now go to Code behind file(.cs code) and add the following Code: using System; using System.Windows.Forms; namespace AutoCompleteTextBoxDemo { public partial class Form1 : Form { public Form1() { InitializeComponent(); } //AutoCompleteData Method private void autoCompleteData() { //Set AutoCompleteSource property of txt_StateName as CustomSource txt_StateName.AutoCompleteSource = AutoCompleteSource.CustomSource; //Set AutoCompleteMode property of txt_StateName as SuggestAppend. SuggestAppend Applies both Suggest and Append txt_StateName.AutoCompleteMode = AutoCompleteMode.SuggestAppend; txt_StateName.AutoCompleteCustomSource.AddRange(new string[]{"Maharastra","Andhra Pradesh","Assam","Punjab","Arunachal Pradesh","Bihar","Goa","Gujarat","Haryana"}); } private void Form1_Load(object sender, EventArgs e) { autoCompleteData(); } } } In the preeceding code, We set the AutoCompleteSource, AutoCompleteMode and AutoCompleteCustomSource properties of Textbox named as txt_StateName so that it automatically completes the input string. Preview: AutoComplete TextBox using a Database: In this example, We will Suggest/Append the data in TextBox(txt_StateName) from the Database. For Demonstration, I have created a Database (named Sample). Add a Table, tbl_State. The following is the table schema for creating tbl_State. Add the following lines of code: using System; using System.Windows.Forms; using System.Data.SqlClient; namespace AutoCompleteTextBoxDemo { public partial class Form2 : Form { public Form2() { InitializeComponent(); } private void autoCompleteData() { SqlConnection con = new SqlConnection("Data Source=.;Initial Catalog=Sample;Integrated Security=true;"); SqlCommand com = new SqlCommand("Select State from tbl_State", con); con.Open(); SqlDataReader rdr = com.ExecuteReader(); //AutoCompleteStringCollection Contains a collection of strings to use for the auto-complete feature on certain Windows Forms controls. AutoCompleteStringCollection autoCompleteCollection = new AutoCompleteStringCollection(); while (rdr.Read()) { autoCompleteCollection.Add(rdr.GetString(0)); } //Set AutoCompleteSource property of txt_StateName as CustomSource txt_StateName.AutoCompleteSource = AutoCompleteSource.CustomSource; //Set AutoCompleteMode property of txt_StateName as SuggestAppend. SuggestAppend Applies both Suggest and Append txt_StateName.AutoCompleteMode = AutoCompleteMode.SuggestAppend; txt_StateName.AutoCompleteCustomSource = autoCompleteCollection; con.Close(); } //Form2_Load Event private void Form2_Load(object sender, EventArgs e) { autoCompleteData(); } } } Preview: Hope you like it. Thanks.
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