Webgrid Exception in mvc

Sagar Bandkar

10y3.8k.NET

Exception:-A data source must be bound before this operation can be performed.

I am using webgrid to display data and i am using validation ,when my code (vcCtgCode) is null

it display above exception ,How to Overcome the exception.

@model IEnumerable<******.Model.tblMstCategory_CTG>

var grid = new WebGrid(Model, ajaxUpdateContainerId: "inCtgId");

@grid.GetHtml(

tableStyle: "webgrid-table",

headerStyle: "webgrid-header",

footerStyle: "webgrid-footer",

alternatingRowStyle: "webgrid-alternating-row",

selectedRowStyle: "webgrid-selected-row",

rowStyle: "webgrid-row-style",

htmlAttributes: new { id = "Grid" },

//mode: WebGridPagerModes.All,

columns: new[]

{

grid.Column("inCtgId",header:"Id")

,grid.Column("vcCtgCode",header:"Code",format: (item)=> string.IsNullOrEmpty(item.vcCtgCode)?string.Empty:item.vcCtgCode)

})

}

3 Replies

Know the answer? Post it — somebody with the same question will find it here.

Rajeesh Menoth10y ago
Accepted answer
Hi,

Return corresponding object in View.

Reference :

https://www.asp.net/mvc/overview/older-versions/getting-started-with-ef-5-using-mvc-4/updating-related-data-with-the-entity-framework-in-an-asp-net-mvc-application

Try this code :
public ActionResult Category([Bind(Exclude = "inCtgId")]tblMstCategory_CTG objcategoryMaster_CTG)
{
try
{
if (TempData["insertData"] == "Update") { return Edit(objcategoryMaster_CTG); }
else if (TempData["insertData"] == "Details") { return RedirectToAction("Details"); }
else
{
if (ModelState.IsValid)
{
db.tblMstCategory_CTG.Add(objcategoryMaster_CTG);
db.SaveChanges();
return RedirectToAction("Category");
}
return View(objcategoryMaster_CTG);
}
}
catch (Exception ex) { ex.Message.ToString();return null; }
//return View(objcategoryMaster_CTG);
}
Sagar Bandkar10y ago
Controller:-

[HttpPost]
public ActionResult Category([Bind(Exclude = "inCtgId")]tblMstCategory_CTG objcategoryMaster_CTG)
{
try
{
if (TempData["insertData"] == "Update") { return Edit(objcategoryMaster_CTG); }
else if (TempData["insertData"] == "Details") { return RedirectToAction("Details"); }
else
{
if (ModelState.IsValid)
{
db.tblMstCategory_CTG.Add(objcategoryMaster_CTG);
db.SaveChanges();
return RedirectToAction("Category");
}
return View();
}
}
catch (Exception ex) { ex.Message.ToString(); return View("Error"); }
}
Rajeesh Menoth10y ago
Hi,

Share your controller code.

Example :
public ActionResult Index()
{
List emp = new List();
return View(emp);//return emp otherwise it return null
}
Reference :

http://stackoverflow.com/questions/22252621/a-data-source-must-be-bound-before-this-operation-can-be-performed