problem with empty field in gridview when updating

Question

Hi When editing a row of a gridview, some fields can remain empty. But with this code, i get the error (if field 'name" remained empty) when updating: "Object reference not set to an instance of an object.": protected void GridView1_RowUpdating(object sender, System.Web.UI.WebControls.GridViewUpdateEventArgs e) string name; name = e.NewValues["name"].ToString(); I tried to prevent that with this code: if (string.IsNullOrEmpty(e.NewValues["name"].ToString()) == true) name = e.NewValues["name"].ToString(); else name =""; But I get the same error (at line if ...) Thanks for help. V

Salman Beg · Answer

Remove == true from your if condition. Also don't use ToString() and in place of that you can use Convert.ToString(e.NewValues["name"]) Thanks

Valerie Meunier · Answer

Hi guys, i finally found the solution: this works: string name; if (Convert.ToString(e.NewValues["name"]) != "" ) vnaam = e.NewValues["name"].ToString(); else name = ""; This gives the error: Object reference not set to an instance of an object.: string name; name = e.NewValues["name"].ToString() == null ? "" : e.NewValues["name"].ToString(); or name = e.NewValues["name"].ToString() == ""l ? "" : e.NewValues["name"].ToString();

Sachin Singh · Answer

test this name = e.NewValues[ "name" ].ToString()== null ? "" :e.NewValues[ "name" ].ToString();

Valerie Meunier · Answer

Ok, i was too fast. Sorry. if (Convert.ToString(e.NewValues["vnaam"])) gives "cannot convert string to bool" With (Convert.ToBoolean(e.NewValues["vnaam"])), i get an error when the field is filled:" String was not recognized as a valid Boolean. With name = e.NewValues["name"].ToString()==null?"":e.NewValues["name"].ToString(); i get the error: CS0165: Use of unassigned local variable name at the line (a little bit further): if (name == "" ) {e.Cancel = true ; Page.ClientScript.RegisterClientScriptBlock( this .GetType(), "myscript" , " alert( 'name is empty.' );", true ); nametxt.Focus(); } Thanks.

Valerie Meunier · Answer

Hi, thanks both for replying. I tried the solution of Salman Beg but it works like this: if (Convert. ToBoolean (e.NewValues["name"])) Tomorrow, i'll try the solution of Sachin Singh.