Text is long then display as ......

Just add an attribute to a particular column in the GridView and set the style "word-break:break-all;word-wrap:break-word" and at RowCreated event of GridView we set the Width of the column that we need to wrap.

protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
    if (e.Row.RowType == DataControlRowType.DataRow)
    {
        e.Row.Cells[0].Attributes.Add("style", "word-break:break-all;word-wrap:break-word");
    }
}

protected void GridView1_RowCreated(object sender, GridViewRowEventArgs e)
{
    //just changed the index of columns and the value of Unit based on your requirements
    this.GridView1.Columns[0].ItemStyle.Width = new Unit(100);
}

Good luck,
OI