//展现用户信息public void Bind(){var user = from c in db.U_user select c;dataGridView1.DataSource = user;}//提交信息private void button1_Click(object sender, EventArgs e){U_user user=new U_user();user.Name=txtname.Text;user.Pass=txtpass.Text;user.Type=txttype.Text;db.U_user.AddObject(user);db.SaveChanges();this.Bind();}//更新信息private void button2_Click(object sender, EventArgs e){int num = Convert.ToInt32(txtid.Text);var user =( from c in db.U_user where c.ID==numselect c).FirstOrDefault<U_user>();if (user != null){user.Name = txtname.Text;user.Pass = txtpass.Text;user.Type = txttype.Text;db.SaveChanges();}this.Bind();}//删除信息private void button3_Click(object sender, EventArgs e){int num = Convert.ToInt32(txtid.Text);var user = db.U_user.Where<U_user>(a => a.ID == num).FirstOrDefault<U_user>();db.DeleteObject(user);db.SaveChanges();}//获取当前行private void dataGridView1_CellClick(object sender, DataGridViewCellEventArgs e){txtid.Text = dataGridView1.CurrentRow.Cells[0].Value.ToString();txtname.Text = dataGridView1.CurrentRow.Cells[1].Value.ToString();txtpass.Text = dataGridView1.CurrentRow.Cells[2].Value.ToString();txttype.Text = dataGridView1.CurrentRow.Cells[3].Value.ToString();}

<EntityType Name="U_user"><Key><PropertyRef Name="ID" /></Key><Property Name="ID" Type="int" StoreGeneratedPattern="Identity" Nullable="false" /><Property Name="Name" Type="nvarchar" Nullable="false" MaxLength="12" /><Property Name="Pass" Type="nvarchar" Nullable="false" MaxLength="12" /><Property Name="Type" Type="nvarchar" Nullable="false" MaxLength="10" /></EntityType>

 <EntityType Name="U_user"><Key><PropertyRef Name="ID" /></Key><Property Type="Int32" Name="ID" Nullable="false" annotation:StoreGeneratedPattern="Identity" /><Property Type="String" Name="Name" Nullable="false" MaxLength="12" /><Property Type="String" Name="Pass" Nullable="false" MaxLength="12" /><Property Type="String" Name="Type" Nullable="false" MaxLength="10" /></EntityType>

<EntitySetMapping Name="U_user"><EntityTypeMapping TypeName="IsTypeOf(Model1.U_user)"><MappingFragment StoreEntitySet="U_user"><ScalarProperty Name="ID" ColumnName="ID" /><ScalarProperty Name="Name" ColumnName="Name" /><ScalarProperty Name="Pass" ColumnName="Pass" /><ScalarProperty Name="Type" ColumnName="Type" /></MappingFragment></EntityTypeMapping></EntitySetMapping>