使用 Int32.TryParse Method（System） [ ^ ]

 int id; 
 if（int.TryParse（IdRowtextBox.Text.Trim（），out id））
 {
 var get = dc.table.Where（b => b.IdRow == id ）.SingleOrDefault（）; 
 nametextBox.Text = get.name.ToString（）; 
} 

这是模型实体中的问题，我添加了错误的关联。

I'm trying to set row name in textbox from database table using Entity Model But I'm getting this message error "

"Input string was not in a correct format"

" in the query code :

var get = dc.table.Where(b => b.IdRow ==  id).SingleOrDefault();

I'm using "IdRow = key research"


it's not the first time I use this code !
Thank you for you help.

What I have tried:

private void IdRowtextBox_KeyUp(object sender, KeyEventArgs e)
       {
           if (e.KeyCode == Keys.Enter)
           {

                Entities dc = new Entities();
                int id = Convert.ToInt32(IdRowtextBox.Text) ;

                var get = dc.table.Where(b => b.IdRow ==  id).SingleOrDefault();
                nametextBox.Text = get.name.ToString ();

use Int32.TryParse Method (System)[^]

int id;
           if (int.TryParse(IdRowtextBox.Text.Trim(), out id))
           {
               var get = dc.table.Where(b => b.IdRow == id).SingleOrDefault();
               nametextBox.Text = get.name.ToString();
           }

It was a problem in the model entity  , I added a wrong association .