Set color of text in a Textbox/Label to Red and make it bold
TextBox1.ForeColor = Color.Red;TextBox1.Font.Bold = True;Or this can be done using a CssClass (recommended):
.highlight{ color:red; font-weight:bold;}TextBox1.CssClass = "highlight";Or the styles can be added inline:
TextBox1.Attributes["style"] = "color:red; font-weight:bold;";
Try using the property ForeColor.Like this :
TextBox1.ForeColor = Color.Red;
string minusvalue = TextBox1.Text.ToString();if (Convert.ToDouble(minusvalue) < 0){ // set color of text in TextBox1 to red color and bold. TextBox1.ForeColor = Color.Red;}