指定的转换无效。指定的转换无效。怎么解决啊？

[morganadapter]

public DB_TH_GONGCHENGDataSet.carry_tableDataTable carryds;
public DataRow[] drs;
public void sumCarry()
{
float carrysumincoming=new float();
// float carrysumoutpay = new float();

carryds = new DB_TH_GONGCHENGDataSet.carry_tableDataTable();
carry_tableTableAdapter.Fill(carryds);
//drs = new DataRow();
// carryds.Select("contr_Number='"+contr_Number+"'" );
drs = carryds.Select("contr_Number='" + contr_Number + "'");
foreach( DataRow da in drs)
{
carrysumincoming += ((float)(da["jzsr_Money"])); //// carrysumoutpay += (float)da["jzzc_Money"]; //该剧提示：指定的转换无效。怎么解决啊？
}
textBox1.Text = carrysumincoming.ToString();
// textBox2.Text = carrysumoutpay.ToString();

}

[宝_爸]

jzsr_Money字段是float类型的数据吗？
可以试一试
Convert.ToSingle(da["jzsr_Money"].ToString());

[JeffrySun]

Console.WriteLine(da["jzsr_Money"].ToString());

看看这里面是什么东西。

[我姓区不姓区]

jzsr_Money是什么类型的

[king520520]

carrysumincoming += ((float)(da["jzsr_Money"]));

carrysumincoming +=Convert.ToSingle(da["jzsr_Money"]);