How to add columns in a DataGridView in C#?

In C#, columns can be added to a DataGridView using the following code:

1. Add a column using the Add() method.

dataGridView1.Columns.Add("ColumnName", "Column Header Text");

1. Create a DataGridViewTextBoxColumn object and add it to the column collection.

DataGridViewTextBoxColumn column = new DataGridViewTextBoxColumn();
column.Name = "ColumnName";
column.HeaderText = "Column Header Text";
dataGridView1.Columns.Add(column);

1. Create a DataGridViewColumn object that contains column information and add it to the column collection.

DataGridViewColumn column = new DataGridViewColumn();
column.Name = "ColumnName";
column.HeaderText = "Column Header Text";
column.CellTemplate = new DataGridViewTextBoxCell();
dataGridView1.Columns.Add(column);

Please ensure that the DataGridView’s data source has been set before adding columns.