C#

<br />
		public void AutoSizeGrid(DataGrid gridTasks) <br />
 <br />
		{ <br />
			// DataGrid should be bound to a DataTable for this part to <br />
			// work. <br />
			int numRows = ((DataTable)gridTasks.DataSource).Rows.Count; <br />
			Graphics g = Graphics.FromHwnd(gridTasks.Handle); <br />
			StringFormat sf = new StringFormat(StringFormat.GenericTypographic); <br />
			SizeF size; <br />
<br />
			// Since DataGridRows[] is not exposed directly by the DataGrid <br />
			// we use reflection to hack internally to it.. There is actually <br />
			// a method get_DataGridRows that returns the collection of rows <br />
			// that is what we are doing here, and casting it to a System.Array <br />
			MethodInfo mi = gridTasks.GetType().GetMethod("get_DataGridRows", <br />
				BindingFlags.FlattenHierarchy | BindingFlags.IgnoreCase | BindingFlags.Instance <br />
				| BindingFlags.NonPublic | BindingFlags.Public | BindingFlags.Static); <br />
			System.Array dgra = (System.Array)mi.Invoke(gridTasks,null); <br />
<br />
			// Convert this to an ArrayList, little bit easier to deal with <br />
			// that way, plus we can strip out the newrow row. <br />
			ArrayList DataGridRows = new ArrayList(); <br />
 <br />
			foreach (object dgrr in dgra) <br />
			{ <br />
				if (dgrr.ToString().EndsWith("DataGridRelationshipRow")==true) <br />
					DataGridRows.Add(dgrr); <br />
			} <br />
 <br />
			// Now loop through all the rows in the grid <br />
			for (int i = 0; i < numRows; ++i) <br />
			{ <br />
				// Here we are telling it that the column width is set to <br />
				// 400.. so size will contain the Height it needs to be.<br />
				size = g.MeasureString(gridTasks[i,1].ToString(),gridTasks.Font,400,sf); <br />
				int h = Convert.ToInt32(size.Height);<br />
				// Little extra cellpadding space <br />
				h = h + 8; <br />
				// Now we pick that row out of the DataGridRows[] Array <br />
				// that we have and set it's Height property to what we <br />
				// think it should be. <br />
				PropertyInfo pi = DataGridRows[i].GetType().GetProperty("Height"); <br />
				pi.SetValue(DataGridRows[i],h,null); <br />
				// I have read here that after you set the Height in this manner that you should <br />
				// Call the DataGrid Invalidate() method, but I haven't seen any prob with not calling it.. <br />
			} <br />
			g.Dispose(); <br />
		}<br />

while (true)
{

}

while (true)
{
    Application.DoEvents();
}