---
title: "how to remove and add css class to a specific textbox inside gridview in c# asp.net?"
description: "how to remove and add css class to a specific textbox inside gridview in c# asp.net?"
author: "Anonymous User"
published: 2013-12-18
updated: 2013-12-18
canonical: https://www.mindstick.com/forum/1800/how-to-remove-and-add-css-class-to-a-specific-textbox-inside-gridview-in-c-sharp-asp-dot-net
category: "asp.net"
tags: ["asp.net"]
reading_time: 4 minutes
---
# how to remove and add css class to a specific textbox inside gridview in c# asp.net?
[Please tell me](https://www.mindstick.com/forum/33900/please-tell-me-what-are-the-technique-to-content-optimization) how to [remove](https://yourviews.mindstick.com/story/4554/8-harmful-weeds-to-remove-from-garden) and add [CssClass](https://www.mindstick.com/forum/12787/how-to-get-access-to-cssclass-property-for-server-element-isn-t-webcontrol-in-asp-dot-net) to a specific [textbox](https://www.mindstick.com/forum/12714/dynamic-textbox-in-gridview) inside [gridview](https://www.mindstick.com/articles/873/update-delete-edit-gridview-in-asp-dot-net) ?
This is what i have tried but it doesnot changee css for the textbox
## my css in my .aspx page is :
```
```
in my [button click](https://www.mindstick.com/forum/790/form-gets-submiited-twice-on-button-click) here is my code for gridview looping where depending upon the [condition](https://www.mindstick.com/forum/12711/select-query-with-and-condition) i want to change the border [color](https://www.mindstick.com/articles/77/how-to-split-form-background-color-in-c-sharp) of the textbox;
```
var result = (from f in dtCloned.AsEnumerable() group f by f.Field("AssetDescription") into g select new { AssetDescription = g.Key, TotalAmount = g.Sum(r => r.Field("Amount")) });foreach (var aAsset in result.AsEnumerable()){ if (aAsset.TotalAmount < 0) { foreach (GridViewRow arow in GridProjectDetails.Rows) { string AssetDescription = ((TextBox)arow.FindControl("TextAssetDescription")).Text; if (AssetDescription == aAsset.AssetDescription) { ((TextBox)arow.FindControl("TextAmount")).CssClass = "erroramount"; } } } }
```
## Replies
### Reply by Anonymous User
Hi Ashish,\
I got the output by removing the existing (default) css class and adding this css class with textbox. it worked.
## Here is the complete code
```
protected void btnSubmit_Click(object sender, EventArgs e) { ValidateAmount(); } private void ValidateAmount() { System.Data.DataTable dtGridData = new DataTable(); DataTable dtCloned = new DataTable(); dtGridData.Columns.Add("ID", typeof(string)); dtGridData.Columns.Add("CapitalizationProjectID", typeof(string)); dtGridData.Columns.Add("CapitalizationFormID", typeof(string)); dtGridData.Columns.Add("DocumentNumber", typeof(string)); dtGridData.Columns.Add("RowPosition", typeof(string)); dtGridData.Columns.Add("WBSElement", typeof(string)); dtGridData.Columns.Add("PODocument", typeof(string)); dtGridData.Columns.Add("PODocumentText", typeof(string)); dtGridData.Columns.Add("NameOfOffsettingAccount", typeof(string)); dtGridData.Columns.Add("Amount", typeof(string)); dtGridData.Columns.Add("PostingDate", typeof(string)); dtGridData.Columns.Add("CostAllocation", typeof(string)); dtGridData.Columns.Add("PlantCode", typeof(string)); dtGridData.Columns.Add("LocationCode", typeof(string)); dtGridData.Columns.Add("Location", typeof(string)); dtGridData.Columns.Add("CostCenter", typeof(string)); dtGridData.Columns.Add("CostCenterDescription", typeof(string)); dtGridData.Columns.Add("AssetDescription", typeof(string)); dtGridData.Columns.Add("DateAssetPutIntoService", typeof(string)); dtGridData.Columns.Add("TagNumber", typeof(string)); dtGridData.Columns.Add("Quantity", typeof(string)); dtGridData.Columns.Add("UnitOfMeasure", typeof(string)); dtGridData.Columns.Add("IsAdditionToExistingAsset", typeof(string)); dtGridData.Columns.Add("IsSubAsset", typeof(string)); dtGridData.Columns.Add("Serial", typeof(string)); dtGridData.Columns.Add("Vendor", typeof(string)); dtGridData.Columns.Add("Manufacturer", typeof(string)); dtGridData.Columns.Add("IsDeleted", typeof(string)); dtGridData.Columns.Add("IsSplit", typeof(string)); dtGridData.Columns.Add("SplitReference", typeof(string)); dtGridData.Columns.Add("NoOfSplits", typeof(string)); foreach (GridViewRow row in GridProjectDetails.Rows) { string Id = ((TextBox)row.FindControl("ID")).Text; string CapitalizationProjectID = ((TextBox)row.FindControl("CapitalizationProjectID")).Text; string CapitalizationFormID = ((TextBox)row.FindControl("CapitalizationFormID")).Text; string DocumentNumber = ((Label)row.FindControl("LabelDocumentNumber")).Text; string RowPosition = ((Label)row.FindControl("LabelRowPosition")).Text; string WBSElement = ((Label)row.FindControl("TextWBSElement")).Text; string PODocument = ((Label)row.FindControl("TextPurchDoc")).Text; string PODocumentText = ((Label)row.FindControl("TextPurchaseOrderText")).Text; string NameOfOffsettingAccount = ((Label)row.FindControl("TextName")).Text; string Amount = ((TextBox)row.FindControl("TextAmount")).Text; string PostingDate = ((Label)row.FindControl("TextPostingDate")).Text; string CostAllocation = ((TextBox)row.FindControl("TextCostAllocation")).Text; string PlantCode = ((TextBox)row.FindControl("TextPlantCode")).Text; string LocationCode = ((TextBox)row.FindControl("TextLocationCode")).Text; string Location = ((TextBox)row.FindControl("TextLocation")).Text; string CostCenter = ((TextBox)row.FindControl("TextCostCenter")).Text; string CostCenterDescription = ((TextBox)row.FindControl("TextCostCenterDescription")).Text; string AssetDescription = ((TextBox)row.FindControl("TextAssetDescription")).Text; string DateAssetPutIntoService = ((TextBox)row.FindControl("TextDateAssetPutIntoService")).Text; string TagNumber = ((TextBox)row.FindControl("TextTagNumber")).Text; string Quantity = ((TextBox)row.FindControl("TextQuantity")).Text; string UnitOfMeasure = ((DropDownList)row.FindControl("DropDownUnitOfMeasure")).Text; string IsAdditionToExistingAsset = ((TextBox)row.FindControl("TextIsAdditionToExistingAsset")).Text; string IsSubAsset = ((TextBox)row.FindControl("TextIsSubAsset")).Text; string Serial = ((TextBox)row.FindControl("TextSerial")).Text; string Vendor = ((TextBox)row.FindControl("TextVendor")).Text; string Manufacturer = ((TextBox)row.FindControl("TextManufacturer")).Text; string IsSplit = ((TextBox)row.FindControl("IsSplit")).Text; string SplitReference = ((TextBox)row.FindControl("SplitReference")).Text; string NoOfSplits = ((TextBox)row.FindControl("NoOfSplits")).Text; DataRow dr = dtGridData.NewRow(); dr["Id"] = Id; dr["CapitalizationProjectID"] = CapitalizationProjectID; dr["CapitalizationFormID"] = CapitalizationProjectID; dr["DocumentNumber"] = DocumentNumber; dr["RowPosition"] = RowPosition; dr["WBSElement"] = WBSElement; if (PODocument != "") { dr["PODocument"] = PODocument; } else { dr["PODocument"] = null; } dr["PODocumentText"] = PODocumentText; dr["NameOfOffsettingAccount"] = NameOfOffsettingAccount; if (Amount.Contains(',')) { Amount = Amount.Replace(",", ""); } dr["Amount"] = Amount; dr["PostingDate"] = PostingDate; dr["CostAllocation"] = CostAllocation; dr["PlantCode"] = PlantCode; dr["LocationCode"] = LocationCode; dr["Location"] = Location; dr["CostCenter"] = CostCenter; dr["CostCenterDescription"] = CostCenterDescription; dr["AssetDescription"] = AssetDescription; dr["DateAssetPutIntoService"] = DateAssetPutIntoService; dr["TagNumber"] = TagNumber; dr["Quantity"] = Quantity; dr["UnitOfMeasure"] = UnitOfMeasure; dr["IsAdditionToExistingAsset"] = IsAdditionToExistingAsset; dr["IsSubAsset"] = IsSubAsset; dr["Serial"] = Serial; dr["Vendor"] = Vendor; dr["Manufacturer"] = Manufacturer; dr["IsSplit"] = IsSplit; dr["SplitReference"] = SplitReference; dr["NoOfSplits"] = NoOfSplits; dtGridData.Rows.Add(dr); dtCloned = dtGridData.Clone(); dtCloned.Columns["Amount"].DataType = typeof(double); foreach (DataRow arow in dtGridData.Rows) { dtCloned.ImportRow(arow); } } var result = (from f in dtCloned.AsEnumerable() group f by f.Field("AssetDescription") into g select new { AssetDescription = g.Key, TotalAmount = g.Sum(r => r.Field("Amount")) }); foreach (var aAsset in result.AsEnumerable()) { if (aAsset.TotalAmount < 0) { if (!lblMessage.Text.Contains("
Total Amount cannot be negative for same asset - " + aAsset.AssetDescription.ToString())) { lblMessage.Text = lblMessage.Text + "\n" + "
Total Amount cannot be negative for same asset - " + aAsset.AssetDescription.ToString(); lblMessage.Attributes.Add("style", "color:Red;font-weight:bold;"); lblMessage.Visible = true; } foreach (GridViewRow arow in GridProjectDetails.Rows) { string AssetDescription = ((TextBox)arow.FindControl("TextAssetDescription")).Text; if (AssetDescription == aAsset.AssetDescription) { ((TextBox)arow.FindControl("TextAmount")).CssClass = ((TextBox)arow.FindControl("TextAmount")).CssClass.Replace("amount", " "); ((TextBox)arow.FindControl("TextAmount")).CssClass = "erroramount"; } } } }}
```
---
Original Source: https://www.mindstick.com/forum/1800/how-to-remove-and-add-css-class-to-a-specific-textbox-inside-gridview-in-c-sharp-asp-dot-net
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