ComboBox with DataGridView in C#

Using ComboBox with DataGridView is not that complex anymore but it’s almost mandatory while doing some data driven software development.

I have created a DataGridView like this one. Now, I want to show “Month” and “Item” instead of “MonthID” and “ItemID” in DataGridView.

            //Item Data Source

            string selectQueryStringItem= "SELECT ItemID,ItemText FROM Table_Item";

            SqlDataAdapter sqlDataAdapterItem = new SqlDataAdapter(selectQueryStringItem, sqlConnection);
            SqlCommandBuilder sqlCommandBuilderItem = new SqlCommandBuilder(sqlDataAdapterItem);

            DataTable dataTableItem = new DataTable();
            sqlDataAdapterItem.Fill(dataTableItem);
            BindingSource bindingSourceItem = new BindingSource();
            bindingSourceItem.DataSource = dataTableItem;

            //Month Data Source

            string selectQueryStringMonth = "SELECT MonthID,MonthText FROM Table_Month";

            SqlDataAdapter sqlDataAdapterMonth = new SqlDataAdapter(selectQueryStringMonth, sqlConnection);
            SqlCommandBuilder sqlCommandBuilderMonth = new SqlCommandBuilder(sqlDataAdapterMonth);

            DataTable dataTableMonth= new DataTable();
            sqlDataAdapterMonth.Fill(dataTableMonth);
            BindingSource bindingSourceMonth = new BindingSource();
            bindingSourceMonth.DataSource = dataTableMonth;

Let’s start with preparing DataSource for “Item” and “Month” ComboBox.

            //Adding  Month Combo

            DataGridViewComboBoxColumn ColumnMonth = new DataGridViewComboBoxColumn();

            ColumnMonth.DataPropertyName = "MonthID";

            ColumnMonth.HeaderText = "Month";
            ColumnMonth.Width = 120;

            ColumnMonth.DataSource = bindingSourceMonth;
            ColumnMonth.ValueMember = "MonthID";
            ColumnMonth.DisplayMember = "MonthText";

  dataGridViewComboTrial.Columns.Add(ColumnMonth);


            //Adding  Year TextBox

            DataGridViewTextBoxColumn ColumnYear = new DataGridViewTextBoxColumn();
            ColumnYear.HeaderText = "Year";
            ColumnYear.Width = 80;
            ColumnYear.DataPropertyName = "Year";
  
  dataGridViewComboTrial.Columns.Add(ColumnYear);

Set the “DataSource” and most importantly set the “DataPropertyName” accurately for “ColumnMonth” .

            //Adding  Item ComboBox

            DataGridViewComboBoxColumn ColumnItem = new DataGridViewComboBoxColumn();
            ColumnItem.DataPropertyName = "ItemID";
            ColumnItem.HeaderText = "Item";
            ColumnItem.Width = 120;

            ColumnItem.DataSource = bindingSourceItem;
            ColumnItem.ValueMember = "ItemID";
            ColumnItem.DisplayMember = "ItemText";

            dataGridViewComboTrial.Columns.Add(ColumnItem);

            //Adding  Year TextBox

            DataGridViewTextBoxColumn ColumnSaleAmount = new DataGridViewTextBoxColumn();
            ColumnSaleAmount.HeaderText = "Total Sale";
            ColumnSaleAmount.Width = 120;
            ColumnSaleAmount.DataPropertyName = "SaleAmount";

            dataGridViewComboTrial.Columns.Add(ColumnSaleAmount);

            //Adding  Remarks TextBox

            DataGridViewTextBoxColumn ColumnSaleRemarks = new DataGridViewTextBoxColumn();
            ColumnSaleRemarks.HeaderText = "Remarks";
            ColumnSaleRemarks.Width = 150;
            ColumnSaleRemarks.DataPropertyName = "Remarks";

            dataGridViewComboTrial.Columns.Add(ColumnSaleRemarks);

Set the “DataSource” and “DataPropertyName” for “ColumnItem” .

     public partial class DataGridViewComboForm : Form
     {
        private String connectionString = null;
        private SqlConnection sqlConnection = null;
        private SqlDataAdapter sqlDataAdapter = null;
        private SqlCommandBuilder sqlCommandBuilder = null;
        private DataTable dataTable = null;
        private BindingSource bindingSource = null;
        private String selectQueryString = null;

        public DataGridViewComboForm()
        {
            InitializeComponent();
        }

        private void DataGridViewComboForm_Load(object sender, EventArgs e)
        {
            connectionString = ConfigurationManager.AppSettings["connectionString"];
            sqlConnection = new SqlConnection(connectionString);
            sqlConnection.Open();

            //DataGridView Source

            selectQueryString = "SELECT * FROM Table_SaleSummary";
                        
            sqlDataAdapter = new SqlDataAdapter(selectQueryString, sqlConnection);
            sqlCommandBuilder = new SqlCommandBuilder(sqlDataAdapter);

            dataTable = new DataTable();
            sqlDataAdapter.Fill(dataTable);
            bindingSource = new BindingSource();
            bindingSource.DataSource = dataTable;

Prepare DataSource For your DataGridView.

            //Setting Data Source for DataGridView

            dataGridViewComboTrial.DataSource = bindingSource;

Finally, set DataSource for the DataGridView and get your expected output the following one.

        private void addUpadateButton_Click(object sender, EventArgs e)
        {
            try
            {
                sqlDataAdapter.Update(dataTable);
            }
            catch (Exception exceptionObj)
            {
                MessageBox.Show(exceptionObj.Message.ToString());
            }
        }

        private void deleteButton_Click(object sender, EventArgs e)
        {
            try
            {
                dataGridViewComboTrial.Rows.RemoveAt(dataGridViewComboTrial.CurrentRow.Index);
                sqlDataAdapter.Update(dataTable);
            }
            catch (Exception exceptionObj)
            {
                MessageBox.Show(exceptionObj.Message.ToString());
            }

        }

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