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copied!<p>I extended the BaseValidator to achieve this. Its fairly simple once you understand how Validators work. I've included a crude version of code to demonstrate how it can be done. Mind you it's tailored to my problem(like int's should always be > 0) but you can easily extend it.</p> <pre><code> public class RangeValidatorEx : BaseValidator { protected override void AddAttributesToRender(System.Web.UI.HtmlTextWriter writer) { base.AddAttributesToRender(writer); if (base.RenderUplevel) { string clientId = this.ClientID; // The attribute evaluation funciton holds the name of client-side js function. Page.ClientScript.RegisterExpandoAttribute(clientId, "evaluationfunction", "RangeValidatorEx"); Page.ClientScript.RegisterExpandoAttribute(clientId, "Range1High", this.Range1High.ToString()); Page.ClientScript.RegisterExpandoAttribute(clientId, "Range2High", this.Range2High.ToString()); Page.ClientScript.RegisterExpandoAttribute(clientId, "Range1Low", this.Range1Low.ToString()); Page.ClientScript.RegisterExpandoAttribute(clientId, "Range2Low", this.Range2Low.ToString()); } } // Will be invoked to validate the parameters protected override bool ControlPropertiesValid() { if ((Range1High <= 0) || (this.Range1Low <= 0) || (this.Range2High <= 0) || (this.Range2Low <= 0)) throw new HttpException("The range values cannot be less than zero"); return base.ControlPropertiesValid(); } // used to validation on server-side protected override bool EvaluateIsValid() { int code; if (!Int32.TryParse(base.GetControlValidationValue(ControlToValidate), out code)) return false; if ((code < this.Range1High && code > this.Range1Low) || (code < this.Range2High && code > this.Range2Low)) return true; else return false; } // inject the client-side script to page protected override void OnPreRender(EventArgs e) { base.OnPreRender(e); if (base.RenderUplevel) { this.Page.ClientScript.RegisterClientScriptBlock(this.GetType(), "RangeValidatorEx", RangeValidatorExJs(),true); } } string RangeValidatorExJs() { string js; // the validator will be rendered as a SPAN tag on the client-side and it will passed to the validation function. js = "function RangeValidatorEx(val){ " + " var code=document.getElementById(val.controltovalidate).value; " + " if ((code < rangeValidatorCtrl.Range1High && code > rangeValidatorCtrl.Range1Low ) || (code < rangeValidatorCtrl.Range2High && code > rangeValidatorCtrl.Range2Low)) return true; else return false;}"; return js; } public int Range1Low { get { object obj2 = this.ViewState["Range1Low"]; if (obj2 != null) return System.Convert.ToInt32(obj2); return 0; } set { this.ViewState["Range1Low"] = value; } } public int Range1High { get { object obj2 = this.ViewState["Range1High"]; if (obj2 != null) return System.Convert.ToInt32(obj2); return 0; } set { this.ViewState["Range1High"] = value; } } public int Range2Low { get { object obj2 = this.ViewState["Range2Low"]; if (obj2 != null) return System.Convert.ToInt32(obj2); return 0; } set { this.ViewState["Range2Low"] = value; } } public int Range2High { get { object obj2 = this.ViewState["Range2High"]; if (obj2 != null) return System.Convert.ToInt32(obj2); return 0; } set { this.ViewState["Range2High"] = value; } } } </code></pre>

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