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copied!<p>You don't have to use the RowValidated event, that's just the one I used for a little test app to make sure this worked, but this will set the row (not column) header text to whatever year you specify.</p> <p>It would probably go better in the CellFormatting event, actually.</p> <pre><code> private void dataGridView_RowValidated(object sender, DataGridViewCellEventArgs e) { DataGridView gridView = sender as DataGridView; if (null != gridView) { gridView.Rows[e.RowIndex].HeaderCell.Value = "2009"; } } </code></pre> <p><strong>EDIT</strong>: Here's the entire TestForm I used, as simple as possible to demonstrate the solution. Make sure your <strong>RowHeadersWidth</strong> is wide enough to display the text.</p> <pre><code>#region using System.ComponentModel; using System.Windows.Forms; #endregion namespace DataGridViewTest { public class GridTest : Form { /// <summary> /// Required designer variable. /// </summary> private IContainer components; private DataGridView dataGridView1; private DataGridViewTextBoxColumn Month; public GridTest() { InitializeComponent(); } /// <summary> /// Clean up any resources being used. /// </summary> /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param> protected override void Dispose(bool disposing) { if (disposing && (components != null)) { components.Dispose(); } base.Dispose(disposing); } private void dataGridView_RowValidated(object sender, DataGridViewCellEventArgs e) { DataGridView gridView = sender as DataGridView; if (null != gridView) { gridView.Rows[e.RowIndex].HeaderCell.Value = "2009"; } } #region Windows Form Designer generated code /// <summary> /// Required method for Designer support - do not modify /// the contents of this method with the code editor. /// </summary> private void InitializeComponent() { this.dataGridView1 = new System.Windows.Forms.DataGridView(); this.Month = new System.Windows.Forms.DataGridViewTextBoxColumn(); ((System.ComponentModel.ISupportInitialize) (this.dataGridView1)).BeginInit(); this.SuspendLayout(); // // dataGridView1 // this.dataGridView1.AutoSizeColumnsMode = System.Windows.Forms.DataGridViewAutoSizeColumnsMode.Fill; this.dataGridView1.ColumnHeadersHeightSizeMode = System.Windows.Forms.DataGridViewColumnHeadersHeightSizeMode.AutoSize; this.dataGridView1.Columns.AddRange(new System.Windows.Forms.DataGridViewColumn[] { this.Month }); this.dataGridView1.Dock = System.Windows.Forms.DockStyle.Fill; this.dataGridView1.Location = new System.Drawing.Point(0, 0); this.dataGridView1.Name = "dataGridView1"; this.dataGridView1.RowHeadersWidth = 100; this.dataGridView1.Size = new System.Drawing.Size(745, 532); this.dataGridView1.TabIndex = 0; this.dataGridView1.RowValidated += new System.Windows.Forms.DataGridViewCellEventHandler(this.dataGridView_RowValidated); // // Month // this.Month.HeaderText = "Month"; this.Month.Name = "Month"; // // Form1 // this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F); this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font; this.ClientSize = new System.Drawing.Size(745, 532); this.Controls.Add(this.dataGridView1); this.Name = "Form1"; this.Text = "Form1"; ((System.ComponentModel.ISupportInitialize) (this.dataGridView1)).EndInit(); this.ResumeLayout(false); } #endregion } } </code></pre>

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