Check out example codes for "datagridview c# resize columns". It will help you in understanding the concepts better.

Code Example 1

private void Form1_Load(object sender, System.EventArgs e)
    // Bind the DataGridView controls to the BindingSource
    // components and load the data from the database.
    masterDataGridView.DataSource = masterBindingSource;
    detailsDataGridView.DataSource = detailsBindingSource;

    // Resize the master DataGridView columns to fit the newly loaded data.

    // Configure the details DataGridView so that its columns automatically
    // adjust their widths when the data changes.
    detailsDataGridView.AutoSizeColumnsMode = 

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