c# 绑定数据到 DataGridViewComboBoxColumn 没有效果
BindingSource bs = new BindingSource();
BindingSource bss = new BindingSource();
DataTable dt = null;
DataTable dtt = null;
string jhdh = "JH"+DateTime.Now.ToString("yyMMddHHmmss");
private void Frm_jh_Load(object sender, EventArgs e)
{
//给dgvjhz—ataGridView）绑定数据
bs.DataSource = im.rddt();
this.dgvjhz.DataSource = bs;

dt = im.jhgys_data();
这里是查询的地方用的，combox 跟下面的数据源一样----这里可以等到数据
this.cmb_jhgys.DataSource = dt;
this.cmb_jhgys.DisplayMember = "gsmc";
this.cmb_jhgys.ValueMember = "gsmc";

这里是给dgvjhz下coljhzgys（ DataGridViewComboBoxColumn ）绑定数据---这里没有数据不知道为什么
this.coljhzgys.DataSource = dt;
this.coljhzgys.DisplayMember = "gsmc";
this.coljhzgys.ValueMember = "gsmc";


this.dgvjhz.ReadOnly = true;
this.dgvjh.ReadOnly = true;

}

大哥些帮吗看下！！！！！
[解决办法]
中间部分换成

private void Frm_jh_Load(object sender, EventArgs e)
         {
             //给dgvjhz—ataGridView）绑定数据                 
             bs.DataSource = im.rddt();             
 
            dt = im.jhgys_data();
           这里是查询的地方用的，combox 跟下面的数据源一样----这里可以等到数据            
             this.cmb_jhgys.DataSource = dt;
             this.cmb_jhgys.DisplayMember = "gsmc"; 
 
             this.cmb_jhgys.ValueMember = "gsmc";
 
           这里是给dgvjhz下coljhzgys（ DataGridViewComboBoxColumn ）绑定数据---这里没有数据不知道为什么            
             this.coljhzgys.DataSource = dt;
             this.coljhzgys.DisplayMember = "gsmc";
             this.coljhzgys.ValueMember = "gsmc";

            this.dgvjhz.DataSource = bs; 

            this.dgvjhz.ReadOnly = true;
             this.dgvjh.ReadOnly = true;
 
        }
 

 private void Frm_jh_Load(object sender, EventArgs e)
         {
             //给dgvjhz—ataGridView）绑定数据                 
             bs.DataSource = im.rddt();
 
            dt = im.jhgys_data();
           这里是查询的地方用的，combox 跟下面的数据源一样----这里可以等到数据            
             this.cmb_jhgys.DataSource = dt;
             this.cmb_jhgys.DisplayMember = "gsmc";
             this.cmb_jhgys.ValueMember = "gsmc";
 
           这里是给dgvjhz下coljhzgys（ DataGridViewComboBoxColumn ）绑定数据---这里没有数据不知道为什么            
             this.coljhzgys.DataSource = dt;
             this.coljhzgys.DisplayMember = "gsmc";
             this.coljhzgys.ValueMember = "gsmc";

             this.dgvjhz.DataSource = bs;
 

            this.dgvjhz.ReadOnly = true;
             this.dgvjh.ReadOnly = true;
 
        }