C# : Autocomplete TextBox Column in the Datagridview With SQL Server

Autocomplete TextBox Column in the Datagridview With SQL Server In C#

This time, I will teach you how to create an AutoComplete TextBox Column in the Datagridview using C#.net and SQL server 2005 Express Edition. With this, you can auto-suggest and append the column of the Datagridview.

The database of this project is here.

So, Let’s get started.

1. Open Microsoft Visual Studio and create a new windows form application for C#. After that, add a Label and DataGridView in the form and it will look like this.

2. After that, go to the solution explorer and hit “View Code” to fire the code editor.

3. In the code editor, declare and initialize all the classes that are needed.

Note: Put ‘using System.Data.SqlClient;’ above the namespace to access sql server library.

//initializes new instance 
 SqlConnection con = new SqlConnection();
 SqlDataAdapter da = new SqlDataAdapter();
 SqlCommand cmd = new SqlCommand();
 DataTable dt = new DataTable();

5. Go back to the design view, double-click the and do the following codes for adding a TextBox in the Datagridview and establish a connection between SQL Server 2005 and C#.net.

//'declaring a new textbox column in the datagridview
 DataGridViewTextBoxColumn txt = new DataGridViewTextBoxColumn();
 txt.Name = "Books Name";
 txt.Width = 250;
 //'adding a textbox column in the datagridview
 dataGridView1.Columns.Add(txt); 
 
 //set a connection between SQL server and Visual C#
 con.ConnectionString = "Data Source=.\\SQLEXPRESS;Database=dbbooks;trusted_connection=true;";

6. Go back to the design view again and click the Datagridview. After that, go to the properties and hit the lightning symbol. Then, scroll down and find “EditingControlShowing” for the events. Double-click it to fire the event handler of it.

7. Do the following codes in the method to make the TextBox Column autoComplete.

//opening connection
 con.Open();
 try
 {
 //initialize a new instance of sqlcommand
 cmd = new SqlCommand();
 //set a connection used by this instance of sqlcommand
 cmd.Connection = con;
 //set the sql statement to execute at the data source
 cmd.CommandText = "SELECT * FROM tblbooks";
 //initialize a new instance of sqlDataAdapter
 da = new SqlDataAdapter();
 //set the sql statement or stored procedure to execute at the data source
 da.SelectCommand = cmd;
 //initialize a new instance of DataTable
 dt = new DataTable();
 //add or resfresh rows in the certain range in the datatable to match those in the data source.
 da.Fill(dt);


 foreach (DataRow r in dt.Rows)
 {
 //e represent the editing control in the datagridview
 //the condition is, if the type of e is combobox then set your code for autocomplete
 if (e.Control is TextBox)
 {
 DataGridViewTextBoxEditingControl txt = e.Control as DataGridViewTextBoxEditingControl;
 //adding the specific row of the table in the AutoCompleteCustomSource of the textbox
 txt.AutoCompleteCustomSource.Add(r.Field<string>("BooksName"));
 //set the propety of a texbox to autocomplete mode.
 txt.AutoCompleteMode = AutoCompleteMode.SuggestAppend;
 txt.AutoCompleteSource = AutoCompleteSource.CustomSource;
 }

 }
 
 }
 catch (Exception ex)
 {
 //catching error 
 MessageBox.Show(ex.Message);
 }
 //release all resources used by the component
 da.Dispose();
 //closing connection
 con.Close();

Output:

For all students who need a programmer for your thesis system or anyone who needs a source code in any a programming languages. You can contact me @ :

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